Rekan
Mumpung mau week end ,Abah mau ngelantur
sedikit.
Di bkunya LKH yaitu " Candi Muncar" diceriterakan
bahwa Empu Gandring yang selalu mengelana itu bagaimana dia mencari
bintang jatuh alias meteor.
Juga didongenkan bahwa satu waktu dia
berhasil menemukan meteor dan menyulapnya menjadi keris.
Buku buku
karangan LKH asyik deh bcanya.
si Abah
On Fri, April
8, 2011 3:51 pm, RM Iman Argakoesoemah wrote:
> Kalau tertarik
melihat database-nya yg sudah terdokumentasi, bisa dilihat
> pd
alamat ini: http://impacts.rajmon.cz oleh David Rajmon. Di situ belum
> ada data tentang jatuhnya meteorit di Indonesia.
>
> Thanks. Iman
>
>
From: Rovicky Dwi Putrohari
[mailto:[email protected]]
> Sent: Friday, April 08, 2011 3:10
PM
> To: [email protected]
> Subject: Re: [iagi-net-l]
Majelangka Dihantam Meteor Raksasa 4 Juta Tahun
> Lalu !-
>
> Berikut makalah Pak Tjia tentang tumbukan meteor di
Semenanjung Malaya.
> Sayangnya saya tidak punya gambarnya.
> RDP
> HC Potential of Meteorite Impact Structures, Focus on
Sundaland
>
> H. D. Tjia
> Jakarta, January 21,
2004
>
>
> Craters abound on the surfaces of the
Moon, solid planets and their
> satellites. Prior to the manned
Apollo missions, views that the craters of
> the Moon were
products of volcanism or of meteorite impacts were shared
> about
equally. The collected Moon rocks show definitive features of high
> pressure but relatively low-temperature metamorphism that
overwhelmingly
> favour impact origin. On Earth, the suspected
impact depression in the
> Southwestern United States known as
Meteor crater, was found associated
> with high-pressure quartz,
or coesite. Currently some 300 terrestrial
> structures are
considered products of impacts by extraterrestrial objects.
>
Almost two hundred of these have been proven as such by combinations of
> the following: (1) arcuate to circular surface morphology, (2)
circular
> gravity anomaly patterns, (3) shatter cones, (4)
poly-megabreccias
> containing cleaved quartz, (5) quartz and
feldspars with mosaicism (patchy
> extinction), (6) high-pressure
quartz polymorphs of coesite and
> stishovite, (7) anomalously
high Iridium, (8) diaplectic glass, and (9)
> microdiamonds. The
comparatively low density of terrestrial impact craters
> on the
Earth's surface is attributable to reworking by exogenous processes
> of weathering, erosion, organic activity, burial by younger
deposits, and
> the 70 per cent surface cover by water. Impact
craters should be as common
> on Earth as on the solid
extraterrestrial bodies. Calculations suggest a
> mean probability
of over 15,000 significant impact craters having hit land
> since
the Archaean. On land the average depth to diameter ratio of an
>
impact crater is 1 : 0.2 , while rim height is about 4 per cent of the
> total diameter. Also on land, the diameter of simple, bowl-shaped
impact
> craters probably do not exceed 4 km in igneous rocks and
about 2 km in
> sedimentary rock. Beyond these limits, complex
crater morphologies develop
> as result of flattening through
gravity.
>
> The petroleum significance of meteorite
impact structures is -so far- very
> minor, but may be more
important for several reasons. Renewed attention to
> impact
structure plays is relatively recent and was fueled by the 1991
>
single-strike discovery (25 MMBO, 15 BCFG recoverable reserves) in the
> vicinity of Ames, Oklahoma, U.S.A. About twenty years earlier
other
> significant discoveries were made at Red Wing Creek, North
Dakota (20
> MMBO, 25 BCFG), and at the world-famous Chicxulub
region, Yucatan
> Peninsula, Mexico (total recoverable reserves of
30 BBO, 15 TCFG).
> However, the structures of these earlier finds
were not identified as
> astroblemes and at the time of their
discoveries the respective reservoirs
> were considered ordinary
fractured carbonates and fractured
> granite-and-carbonates. The
petroleum occurrences in the vicinity of Ames,
> a small town in
Oklahoma, U.S.A., were the main topic of a special meeting
> in
the early 1990s. The reservoir rocks of the Ames structure are
>
lithified "basement" granodiorite and Cambro-Ordovician Arbuckle
dolomite
> breccia on the crater rim; 2D seismic indicates an
erratic, pocket-like
> distribution of its porosity and
permeability. Trapping is by subsurface
> closures with one known
structural closure. A dolomite caprock and
> overlying Middle
Ordovician Simpson Shale provide the cap and seal. The
> source
consists of the Arbuckle sediments or rocks that were exposed to
>
the "cracking" environment of the meteor impact, and the shales
that were
> deposited in the crater. Flow is c. 250 to 500 BOPD;
with some of the
> wells producing in excess of 250,000 bbl oil,
while one particular well
> has yielded 3 BCFG. Recovery has been
in the 10% to 60% range.
>
> Continental Southeast Asia
includes the tectonic platforms of Indosinia
> and Sundaland . By
virtue of its longer exposure, its thinly covered
> pre-Tertiary
"basement" areas can be expected to host more impact
>
structures than regions containing thick Cenozoic sediments. Good
> reservoir is provided by brecciated and fractured basement rocks,
while
> traps may comprise rim anticlines, irregularly distributed
breccia pockets
> within craters, and central rebound peaks (in
the larger impact
> structures). Internal seals may be provided by
impact-melt cloaks and a
> top seal by the blanketing sediments.
For the Southeast Asian impact
> structures, the hydrocarbon
charge is likely to originate in the Tertiary
> basins. Several
impact structures have been recently discovered in
> pre-Tertiary
Peninsular Malaysia. In the Langkawi islands three of four
>
arcuate ridges are associated with cleaved quartz that crops out as a
sill
> and dyke complex. Other shock-metamorphic features include
ribbon quartz
> and mosaicism.
>
> The two major
craters, named Mahsuri Rings, partially overlap and each is
>
about 2.4 km across. In 280o - 100o direction their centres are 600
metres
> apart. Bouguer gravity cross sections prove their crater
form, one being
> 45 m deep, the other attaining 107 m depth into
the target rocks of
> Carbo-Permian Singa Formation. Both
depressions are filled, the top
> surface consisting of Quaternary
alluvium. The partially encircling hills
> of Singa Formation
crest at less than 150 m elevation and are open to the
> west.
Towards SW are two other circular/arcuate topographic features:
>
Temoyong Ring and horseshoe-shaped Tepor Island. The diameters decrease
in
> the same direction: approximately 800 m and 500 m,
respectively. These
> four ring-like structures have been
interpreted as products of serial
> impacts by a flight of
extraterrestrial projectiles arriving from the
> Southwest. The
impact age is not yet determined and field relations only
>
indicate a post-granite (Triassic-Jurassic) event. In the case that the
> morphologically young Mahsuri Rings are not exhumed features,
impact could
> have occurred within the last 10 million years.
>
> Another proven impact structure is the Paloh Ring that
straddles the state
> boundary between Terengganu and Pahang. The
proof consists of planar
> deformation features (PDFs) and
mosaicism in vein quartz intruded into
> undivided Carboniferous
metasedimentary strata that compose the lower
> eastern slope of
the 623m high Paloh peak. PDFs are also seen in thin
> sections of
quartz phenoclasts of polymict-breccia boulders in Sungai
>
Mengkuang that drains the east side of the hill. Bukit Paloh is the
peak
> on the high, circular topography surrounding a deep
depression, now
> referred to as Paloh Ring-1. This ring-like
topography is 3.5 km across
> and has local relief of the order of
150 to 200 metres. A small -about 0.5
> km across-circular
depression is located on the Paloh Ring-1. The south
> half of the
larger ring consists of felsic igneous rock whose K/Ar age is
>
243 Ma, while the north half is composed of Carboniferous
metasedimentary
> rocks. The youthful morphology of Paloh Ring-1
points to a geologically
> young impact event, estimated to be not
later than Late Miocene. More than
> a decade earlier, PDFs in
quartz were discovered in partly weathered
> granite underlying
the Quaternary basalt at Gebeng, some 40 km SE of Bukit
> Paloh.
The granite at Bukit Ubi quarry, located in the same area but
>
nearer to Kuantan town, also contains quartz with PDFs. These two
findings
> are the initial proofs for impact products in the whole
of Malaysia. It is
> unresolved if the Gebeng-Bukit Ubi impact
products and those at Bukit
> Paloh originated from the same
event.
>
> The third proven impact products are at Bukit
Bunuh near the world-famous
> palaeolithic site of Kota Tampan
along the Perak River. Recently Mokhtar
> Saidin,
geo-archaeologist of Universiti Sains Malaysia, verbally reported
> a 1.74 Ma fission-track age for a volcanic agglomerate composed
of
> unsorted small to huge fragments of quartz, quartzite,
schist, felsic
> igneous rocks, and other as yet unspecified rock
types. The megabreccia is
> set in light-coloured groundmass,
superficially resembling volcanic tuff.
> Thin-section examination
of the quartz turned up parallel planar
> fractures, mosaicismal
extinction and also several cleavage sets. Detailed
> studies are
in progress, but there is little doubt that this
"agglomerate"
> is in fact suevite , an impact breccia.
In spite of alteration by
> oxidation, hydrolisis and local
secondary mineralisation of fractures and
> other voids, porosity
estimates by visual inspection are of the order of
> 10 per
cent.
>
> Satellite and synthetic-aperture radar images
complemented by topographic
> maps and aerial photographs indicate
over 60 prominent arcuate and
> circular features throughout
Malaysia. Craters, geological and geophysical
> field studies,
presence of suevite, and PDFs in quartz prove the impact
> origin
for the Mahsuri Rings in Langkawi, the Paloh Ring-1 on the
>
Terengganu-Pahang border, and the megabreccia at Bukit Bunuh (Kota
Tampan)
> in central Perak. Thirty seven other arcuate/circular
features could be
> impact products and will need confirmatory
studies; eight other structures
> appear to represent domal
intrusions or exhumed volcanic complexes, while
> the remaining
sixteen are meander scrolls and structural basins.
> Contributing
factors of extraterrestrial impacts to petroleum systems
>
comprise depressions favouring source-rock development, enhancement of
> reservoir quality in most of the target rocks, providing a
trapping
> environment for fluids, and perhaps accelerate
maturation. Given that
> prominent impact structures are not rare
in Malaysia and that during the
> Cretaceous-Palaeogene vast
regions of continental Southeast Asia were
> subaerially exposed,
impact-structures probably occur in significant
> numbers. The
initial steps of testing impact-structure plays include
>
expansion and verification of the regional database of impact
structures
> and re-examination of seemingly anomalous subsurface
structures that are
> already known.
>
>
>
> 2011/4/8 R.P.Koesoemadinata
>
<[email protected]<mailto:[email protected]>>
> Saya telusuri di Internet, ternyata banyak sekali lapangan minyak
di
> Amerika yang sudah ada dan diterangkan secara conventional,
sekarang mulai
> diterangkan sebagai akibat meteoric impact. Yang
terjadi adalah
> "fracturing" atau
"brecciation" dari formasi yang ada di bawah impact
>
crater ini yang menjadikkanya sebagai reservoir. Saya kira soal heat
yang
> ditimbulkan untuk mematangkan source rock tidak ada yang
menyinggung. Yang
> penting adalah juga keberadaan seal di
atasnya, yaitu formasi serpih
> post-impact.
> Konsep ini
masih kontroversial dan masih ada pro- dan kontranya, tetapi
>
mainstream geologist saya kira belum menerimanya, tetapi sudah banyak
> tokoh2 petroleum geologist yang meyakininya, seperti Paul Weimer
yang
> sekarang President AAPG, sangat meyakinkan bahwa Red Wing
Creek field
> (dalam formasi Paleozoic) itu adalah hasil dari
impact crater.
> Juga ternyata lapangan minyak terbesar ke-2 di
Mexico, Cantrell field juga
> dihubungkan dengan Chicxulub impact
crater (berada di bawah), yang
> terjadi antara Kapur dan Tersier
(KT boundary, 65,5 juta tahun yang lalu).
> Juga lapangan offshore
Mumbai dihubungkan dengan meteor impact ini. Selain
> itu masih
banyak contoh2 lain di dunia.
> Selain itu banyak pula yang
meyakini bahwa peranan meteor impact pada
> mineral deposit itu
jauh lebih besar dari pada diperkirakan semua, bahkan
> endapan
nikel di Sudbury Canada yang berupa lopoltih itu ditafsirkan
>
sebagai meteorit raksasa. Ada juga yang berspekulasi bahwa fracturing
ini
> sampai ke mantle, dan menghidupkan lagi anorganic origin of
oil.
> Dalam hal Majalengka crater complex berdasarkan peta
geologi yang ada
> daerah ini mencakup Bogor Trough dan juga
sebagian Northwest Java shelf
> basin. Di Bogor trough ini sudah
terkenal banyak oil seeps (terutama di
> Jawa Tengah, walaupun
batuan induknya belum jelas, tetapi pasti ada. Oil
> seep di
Palimanan sudah terlalu jauh. Meteor Majalengka ini (kalau betul
>
ada) kelihatannya menimpa singkapan formasi deep marine turbidits
Cinambo
> berumur Oligo-miocene yang mungkin merupakan batuan
induk.
> Jika benar geo-circles di Majalengka itu meteor impact
yang jadi masalah
> adalah seal. Apakah formasi Citalang dan
sebagian Fm Kaliwangu yang
> berumur Pliocene itu dapat merupakan
seal yang baik.
> Sekali lagi bahwa ada beberapa seismic lines
tahun 89 yang memotong
> complex crater Majalengka ini, entah
disurvei oleh Pertamina entah oleh
> pemegang Citarum block.
Sangat menarik untuk dipelajari apa yang ada di
> bawahnya ini,
saya taruhan itu merupakan "blur" saja yang ditafsirkan
> sebagai thrusting.
>
> Pertanyaan penting lagi
apakah pemegang block Citarum atau Pertamina
> berani melanjutkan
explorasi berdasarkan konsep meteor impact sebagai play
> yang
masih bersifat unconventional ini. Ini akan sangat menarik sekali
> bahkan mungkin akan menemukan lapangan minyak raksasa, karena
sebenarnya
> radius aggregate dari lingkaran-lingkaran ini adalah
lebih dari 5 km.
> Selain itu jika ada yang berani, apakah BPMigas
akan menyetujuinya.?
>
> Kalau saja ada bilioner yang
cukup gila untuk melakukan pemboran explorasi
> di sini dan
berhasil menemukan cadangan, tentu orang akan berlomba-lomba
>
mencari geo-circles di Google Earth.
> Apakah di antara anggota
IAGI net ini mungkin bisa memberikan penjelasan
> geologi lain
bagi Geocircles Majalengka ini, dengan tektonik lengser
>
barangkali?
> Wassalam
> RPK
> -
> ----
Original Message -----
>
From: Yanto
R.Sumantri<mailto:[email protected]>
> To:
iagi-net<mailto:[email protected]>
> Sent: Friday, April
08, 2011 12:13 PM
> Subject: Re: [iagi-net-l] Majelangka Dihantam
Meteor Raksasa 4 Juta Tahun
> Lalu !
>
>
>
> Betul pak Koesoema , memang sulit untuk menerangkan
mekanisme
> nya.
> Saya masih bertanya apa pengaruh suatu
tumbukan terhadap komposisi suatu
> masa di bumi ? bagaimana dan
apakah terjadi perubahan kimia / fisika
> dari masa yang
ditumbuk ?
>
> Mungkin ada rekan yang tahu atau
mengetahu reference - nya
>
>
> si Abah
>
> On Fri, April 8, 2011 9:09 am, R.P.Koesoemadinata
wrote:
>> Young Earth argument, wah saya tidak membaca sampai
kesitu.
>>
>> Tetapi saya kira yg unik dari
Majalengka Crater Complex ini merupakan
>> multiple craters,
yang mungkin ditumbuk oleh se-rentetan meteor yang
>> pada
>> tempat yang sama, mungkin seperti Levy-Schumacher meteors
yang
>> menghantam
>> Jupiter.
>>
>> Saya belum pernah membaca adanya multiple craters ini ditempat
lain di
>> bumi ini, barangkali ada yang mengetahui?
>>
>>
>>
>> Dari segi ekonomi,
barangkali di bawah Majalengka Impact crater complex
>> itu
bisa terjadi akumulasi minyak bumi seperti di lapangan Chicxulub di
>> Mexico. Daerah ini sebelah utaranya masuk Block Jawa Barat
Utara dari
>> Pertamina, sedangkan bagian selatannya adalah
masuk Citarum Block.
>> Tetapi
>> apakah para
pemegang block ini berani mengexplore lebih lanjut. Seingat
>>
saya di daerah ini ada beberapa seismic lines, tetapi apa yg
>>
diperlihatkan
>> oleh seismic sections ini saya tidak tahu,
mungkin blur saja. Barangkali
>> ada yang berpendapat lain?
>>
>>
>>
>> Sampai kini saya
lihat di forum ini belum ada bantahan mengenai hipotesa
>>
impact craters ini, karena saya kira akan sulit sekali dijelaskan
dengan
>> tectonics biasa maupun dengan gliding tectonics.
>>
>> Wassalam
>>
>> RPK
>>
>>
>>
>> To:
[email protected]<mailto:[email protected]>
>> Sent:
Friday, April 08, 2011 7:29 AM
>> Subject: Re: [iagi-net-l]
Majelangka Dihantam Meteor Raksasa 4 Juta
>> Tahun Lalu !
>>
>>
>> Pak Koesoema,
>>
Sepertinya argumentasi "Young Earth" tentang clues for meteoric
crater
>> ini bagian dari diskusi creationism bahwa usia bumi
tidak milyaran tahun
>> itu ya ?
>>
>>
Btw, kalau diameter crater sebesar 3.5 Km, diperkirakan energi tumbukan
>> yg dihasilkan oleh meteor ini setara dengan 400 megaton atau
setara
>> letusan Krakatau 1883. Ini energinya, dampaknya tentu
sangat berbeda.
>>
>> Salam
>>
>> rdp
>>
>> 2011/4/7 R.P.Koesoemadinata
>>
<[email protected]<mailto:[email protected]>>
>>
>> Terima kasih
>> R{K
>>
----- Original Message -----
>>
>
From: Edison
Sirodj
>> To:
<[email protected]<mailto:[email protected]>>
>> Sent: Thursday, April 07, 2011 8:42 PM
>> Subject:
Re: [iagi-net-l] Majelangka Dihantam Meteor Raksasa 4 Juta
>>
Tahun Lalu !
>>
>>
>> pak Kusuma, saya
ada papernya pa Tjia, sewaktu seminar expat di KL
>> 2008.
InsyaAllah besok sy upload.
>>
>>
>>
salam,
>> edison sirodj
>>
>> Sent from
my iPad
>>
>> On Apr 7, 2011, at 20:28,
"R.P.Koesoemadinata"
>>
<[email protected]<mailto:[email protected]>>
wrote:
>> xpat
>> Memang saya pun pernah mendengar
adanya ceramah Prof Tjia itu
>> mengenai meteor crater itu
serta potensi minyak buminya di Jakarta
>>
>> Saya
check di internet publikasi mengenai meteor crater itu yang
>>
saya ketemukan adalah
>> 1. Meteor crater di Bukit Bunuh, Perak
di mana diketemukan batuan
>> suevit sedangkan publikasinya
adalah mengenai paleo-anthropologi
>> (out of Malaysia) dimana
pemandangan geomorphologi dari crater
>> masih terlihat
>> 2. Meteor crater di Langkawi (Seranai Publications)
>> 3. Google juga menunjuk adanya artikel Prof Tjia di Bull Geol
Soc
>> Malaysia, Dec 2010, namun di periodical ini tidak
diketemukan
>> mengenai meteor crater.
>>
>> Yang mengenai di Borneo belum diketemukan publicationsnya
>> Wassalam
>> RPK
>>
>> -----
Original Message -----
>>
>
From: benyamin
sembiring
>> To:
[email protected]<mailto:[email protected]>
>> Sent:
Thursday, April 07, 2011 5:37 PM
>> Subject: Re: [iagi-net-l]
Majelangka Dihantam Meteor Raksasa 4
>> Juta Tahun Lalu !
>>
>>
>> salam,
>>
>>
>> Pak Vic, sorry, karena judul yg dibawakan Prof
Tjia saat itu
>> adalah HYDROCARBON POTENTIAL OF METEORITE
IMPACT STRUCTURES
>> FOCUS ON SUNDALAND
>> Saya rasa
untuk Indonesia, ternyata yang dibahas di malaysia
>> (walaupun
masih satu pulau dgn indonesia, di kalimantan)
>> sori, ada
sedikit kekeliruan
>>
>>
>> M A L A Y S I
A
>>
>>
>> Identified 60 large to
medium
>>
>> ring-like structures
>>
>>
>> 3 proven impact structures
>>
>> üPDFs
>> üImpact breccia or suevite
>> üC r a t e r s
>>
>>
>>
salam
>> benz
>>
>>
>> Pada 7
April 2011 17:10, benyamin sembiring
>>
<[email protected]<mailto:[email protected]>>
>> menulis:
>>
>> Salam,
>>
>>
>> Pak Vic, tentang meteor impact sudah pernah
dilakukan
>> afternoon talk oleh IAGI di Tham Nak Thai resto,
Menteng,
>> tahun 2003/2004?. Saat itu pembicaranya adalah Prof
Tjia Hong
>> Jin. Seingat saya beliau menjelaskan
pembentukan
>> cekungan-cekungan oleh karena adanya meteor
impact. Banyak
>> gambar-gambar yang disajikan, termasuk di
Indonesia. Semoga
>> saya gak salah.
>> Acara itu
memang minim peserta, yang hadir nampaknya saat itu
>> para
senior/sepuh geologi, lebih tepat seperti reunian senior
>>
geologi. Materi presentasi apakah diberikan kepada IAGI waktu
>> itu saya agak lupa.
>> Nampaknya, Prof Tjia sudah
punya lebih dari satu meteoric
>> creater impact.
>>
>>
>> Salam
>> benz
>>
>>
>>
>>
>>
>> Pada 7 April 2011 15:08, Rovicky Dwi Putrohari
>>
<[email protected]<mailto:[email protected]>> menulis:
>>
>>
>> Sebuah hipotesa menarik dari Pak
Koesoema tentang
>> kemungkinan hantaman meteor di dekat
Majalengka. Meteoric
>> crater impact diketemukan di hampir
semua belahan dunia,
>> namun sepi di Indonesia. Kalau saja
hipotesa Pak
>> Koesoemadinata ini benar, maka penemuan ini
akan menjadi
>> Meteoric Crater Impact pertama di Indonesia.
Meteoric Impact
>> Ini sedang ditinjau oleh Mahasiswa dari
Geologi ITB
>>
>> Majelangka Dihantam Meteor Raksasa
4 Juta Tahun Lalu !
>> Penyebaran kawah benturan meteor di
seluruh dunia.
>>
>> Selanjutnya silahkan baca di
sini : Meteori crater impact
>> pertama di Indonesia, Bahkan
mungkin pertama di Asia
>> Tenggara !!
>>
>>
>>
>> Rovicky
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> __________ NOD32 5559 (20101024) Information __________
>>
>> This message was checked by NOD32 antivirus
system.
>> http://www.eset.com
>>
>>
>>
>>
>> --
>> "Success is a
mind set, not just an achievement"
>>
>>
>>
>
>
> --
>
_______________________________________________
> Nganyerikeun
hate batur hirupna mo bisa campur, ngangeunahkeun hate jalma
>
hirupna pada ngupama , Elmu tungtut dunya siar Ibadah kudu lakonan.
>
>
>
> --
> "Success is a
mind set, not just an achievement"
>
>
>
________________________________
>
> Keep it on screen -
think before you print
>
>
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>
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Nganyerikeun
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