Pernah nonton film "THE CORE"..?
isinya tentang percobaan yang menyebabkan bumi berhenti berputar...
cukup seru karena scienci fiksi dengan background geologi dan
geophysic.....
Regards
Kartiko-Samodro
Telp : 3852
|---------+---------------------------->
| | Wy Ismara Heru Y |
| | <[EMAIL PROTECTED]|
| | com> |
| | |
| | 14/07/2005 01:58 |
| | PM |
| | Please respond to|
| | iagi-net |
| | |
|---------+---------------------------->
>-----------------------------------------------------------------------------------------------------------------------------|
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| To: [email protected]
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| cc:
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| Subject: Re: [iagi-net-l] Tectonic Mars, Earth.
|
>-----------------------------------------------------------------------------------------------------------------------------|
Saya pernah merangkum paper mengenai Volcanism on
other planets of the solar system untuk tugas kuliah
Referat II, bagian mengenai mars saya copy dibawah.
dari sumber2 yang saya kumpulkan, mereka menyimpulkan
bahwa perbedaan utama antara bumi dan mars terletak
pada plate tectonics. Di Mars tidak terbentuk plate
tectonics seperti halnya di bumi, sehingga mantle
plumes (hotspot) yang terjadi di mars akan membentuk
shield volcanoes yang jauh lebih besar daripada yang
terbentuk di bumi. di bumi sendiri akan cenderung
membentuk deretan shield volcanoes yang relatif lebih
kecil akibat posisi hotspot yang tetap dan lempeng
yang bergerak seperti di kepulauan hawaii.
------
MARS
Mars, the red planet, is classified as the first
of the Superior Planets (The planets outside the orbit
of the earth). With its 6726 km diameter, about half
the size of the Earth, it is one of the smaller planet
on this solar system. Mars has a very thin atmosphere
that protect it's surface, and the average temperature
is -23o C.
Like Venus, Mars shows no sign of plate tectonics.
However, thick layers of dust and sediment cover both
the Northern Lowlands and the large basin floors.
These layers reflect a long history of winds, glaciers
and flood events. They also hide any volcanism that
may have occurred in the low areas on Mars.
Volcanism on Mars
Mars has less than 20 named volcanoes, but one of
it is the biggest volcano on the solar system named
Olympus Mons. Olympus Mons is 600 km across its base
and about 25 km above the surrounding plain and is
rimmed by a 6 kilometers high scarp. This raises the
interesting issue of why Mars in its past developed a
few very large shield volcanoes. As we shall see, the
answer is thought to lie in the absence of plate
tectonics. The concentration and duration of volcanism
into these two regions are attributed to the evolution
of a long-lived mantle hotspot.
The giant shield volcanoes formed between 1 and 2
billion years ago. The youngest lava flows on Olympus
Mons are only 20 to 200 million years old. These flows
are very small, however, and they probably represent
the last gasp of volcanism on Mars. The odds of
finding an active volcano on Mars today are very
small.
-----
references saya dapatkan sebagian besar dari dari
internet :
References
http://volcano.und.nodak.edu/vwdocs/planet_volcano/
http://volcanoes.usgs.gov/edu/
http://www.damtp.cam.ac.uk/user/gr/public/bb_home.html
http://www.lukew.com/marsgeo/
Newcott, William, Venus Revealed, National Geographic
Magazine vol.183 No.2, February 1993, USA.
salam,
.heru.
--- Awang Satyana <[EMAIL PROTECTED]> wrote:
> Pak,
>
> Bagaimanapun, ada perbedaan jauh antara planet Bumi
> dan Mars, juga tektoniknya. Mantle convection bisa
> jadi pernah berjalan di Mars, tetapi kemungkinan
> besar sudah lama sekali berhenti. Sebuah planet
> sekecil Mars tak akan tahan lama-lama menyimpan
> panasnya, paling lama konveksi di mantelnya hanya
> berjalan selama 2 milyar tahun pertamanya.
>
> Sebuah perbedaan lagi muncul dari volkanologi Bumi
> dan Mars. Kompleks gunungapi di Mars hanya berkumpul
> di areal yang disebut giant Tharsis volcanoes
> complex. Gunungnya tinggi2, lebih tinggi dari
> gunungapi2 di Bumi. Di Bumi, kita punya jalur2
> gunungapi yang melingkar sekeliling globe - jelas
> membuktikan bentukan oleh konvergensi antar sisi
> lempeng. Gunungapi2 di Mars mungkin hanya tersembul
> oleh hot superplume yang naik seperti hotspot di
> Bumi, bukan oleh konvergensi lempeng. Itu pun kisah
> dulu, sebab gunungapi2 di Mars pun sudah lama mati,
> hanya menyisakan topografi paling tinggi di relief
> Mars.
>
> Bull eye di planet2 tatasurya semuanya karena efek
> badai atmosfer bukan gerak girdling plate dan island
> arc curvature seperti di Bumi (Banda dan Karibia).
> Yang paling terkenal misalnya, di Yupiter, red bull
> eye-nya atau great red spot-nya adalah vast storm
> system yang membumbung setinggi 30 km lebih di atas
> awan-awan sekitarnya. Warnanya sangat sensitif
> bergantung kepada jumlah gas metana yang
> dikandungnya. Warna pink dan putih punya metana
> paling tinggi, warna kebiruan dan hitam paling
> sedikit metananya. Badai itu punya ukuran 26.000 km
> - lebih dari setengah keliling Bumi yang 40.000 km,
> dan timbul sebagai akibat instabilitas aliran massa
> udara planet yang barat-timur.
>
> Tektonik Mars berguna dipelajar untuk mengetahui
> berapa lama konveksi mantel Bumi akan bertahan.
> Tidak berlebihan kalau dikatakan, bahwa flowing
> water di Mars hilang sejalan konveksi mantel-nya
> berhenti. Air pernah ada di sana, dulu, saat
> mantelnya bergerak. Analogi semacam ini yang perlu
> dilakukan. Lebih dari itu, ke detail tektonik Mars
> dan Bumi, terlalu jauh untuk disebandingkan.
>
> salam,
> awang
>
> "Maryanto (Maryant)" <[EMAIL PROTECTED]> wrote:
>
> Comrades,
>
> Pelajari tectonic bumi dengan data-data tambahan
> Planet Mars, akan lebih
> baik hasilnya. Baker membuat paper sbb:
>
http://us.share.geocities.com/maryanto7/BAKER.Mars.pdf
>
> Banyak data yang sudah di dapat. Masih jauh lebih
> banyak yang belum di
> ketahui, tanda banyak rejeki bagi kita (yang mau di
> kasih). Setelah baca
> itu tadi pagi, saya buat sepintas oret-oretan,
> seperti di bawah sono.
>
> Deduksi model flower structure grade1, misal di
> Cekungan Tarakan, ada 2
> tinggian yang membatasi, lalu ada 10 faults sejajar
> 2 tinggian (high,
> horst) yang membatasi cekungan, serta 10 faults
> sejajar 2 tinggian yang
> membatasi lainnya. Maka akan ada 100 sub cekungan,
> bisa sudah menjadi
> half graben atau baru folding). Di setiap sub basin
> ada 100 gundukan
> lagi. Gampang kan cari antiklin? Yok explore semua
> basins.
>
> Salam,
> Maryanto.
>
>
> Mars Tectonostratigraphy.
> By: Maryanto, 14 July 2005.
>
> Baker et al constructed Mars as magma Ocean in 4.550
> Gaa. Super plume
> has been initiated over 3.9 Gaa therein. Two super
> plumes in the Mars
> are Northern Oceanic plume and Southern Continental
> plume. Two super
> plumes in the earth are the South Pacific oceanic
> super plume, and Mid
> continental super plume (Maryanto 2003 after Collins
> 2003). The South
> East Asia continental-oceanic has similarity in the
> Mars. This border
> mentioned is most probably the Banda Sea as one of 7
> planetary cyclones
> (Maryanto, 2004). The west continental-oceanic
> border cyclone, the
> Caribbean Sea, has most frequent tornado. This are
> may similar to the
> "bull eye" which have been seen in the giant
> planets: Venus, Jupiter,
> Saturn, and Uranus. In the small planets may exist
> but has not been
> detected and need better toll capability to detect.
>
> Flower Structure is a bunch of faults divergent
> vertically, where
> negative flower is constructed by normal faults and
> positive flower is
> constructed by quite convergent inversion faults
> associate with wrench.
> Flower Structure of "SYUKUR" ("Structural plate or
> mass Yields by
> Unrests layer convections as Key Unifying fragmented
> plates or mass
> Reference") is flower structure in atom scale to
> universe scale. Grade3
> Flower is sub basin structure (example is the North
> Aman Sub basin which
> is constructed by 10 NNE-SSW and 10 NWW-SEE parallel
> faults). Grade2
> Flower is basin structure (example is the Central
> Sumatra Basin which is
> constructed by 10 N-S and 10 NW-SE parallel faults).
> Grade1 Flower
> example is constructed by 7 Mega plate fault
> boundaries. Grade0 Flower
> is constructed by gap of planets (example is 10 gaps
> separating the 10
> Solar system masses: Sun, Mercury, Venus, Earth,
> ..., and Pluto). Grade
> cyclic from 0 to 3 are respectively 7 Ga, 700 Ma, 70
> Ma, and 7 Ma. The
> Solar System including the Earth and Mars, was born
> in 4.6 Gaa "Giga
> annum ago".
>
>
>
>
>
>
>
>
>
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