Ini kutipan dari John Allen dan Phillip Allen (1990) penulis buku "Basin Analysis : Principles and Applications", yang banyak digunakan secara luas dan jadi rujukan dalam kursus2 Basin Analysis, tentang syn-rift (page 234). "The nature of the sedimentary fills of a rift basin depends on its climatic zone, uplift pattern of the rift shoulders or arches acting as sediment sources or barriers, subsidence rate of central rift valleys determining alluvial base levels and lake water depths, and tectonic evolution of linked extensional fault systems. The broad features of the initial deposits of rifts are that they are predominantly non-marine, comprising arkosic, commonly volcaniclastic fluviatile deposits, lacustrine (fresh-water or evaporitic) and aeolian deposits. These sediment types typify syn-rift sequences and can be very extensive. Fault-controlled subsidence commonly outpaces sedimentation at later stages of rift development encouraging marine incursions. Shallow marine sediments may be overlain by deeper marine sediments as the rift evolves towards a site of sea floor spreading."
Dan, saya pikir kita semua tahu bahwa apa yang mereka kemukakan itu merupakan ciri utama synrift sequence di cekungan2 Indonesia (Barat). salam, awang Rovicky Dwi Putrohari <[EMAIL PROTECTED]> wrote: Ini salah satu diskusi dengan Minarwan, geologist yg calon doktor di Ustrali. On 2/23/06, Minarwan wrote: > Marine syn-rift yang dibicarakan Joe sama Chris memang marine synrift > mulai dari early sampe late syn-rift Mas. Itu ada di halaman 891 dan > 892. Contoh marine syn-rift source rock ada di North Sea dan Sirte > Basin. Kalo dari North Sea Basin, source rock utamanya adalah Late > Jurassic Kimmeridge Clay cuman aku gak ingat pengendapannya di setting > apa. Mungkin juga source rock lain bisa juga. > > Uniknya Mas, John Underhill bilang North Sea itu udah pernah rifting > pada periode Permian dan Triassic, lalu sejak Early Jurassic menjadi > post-rist (thermal subsidence), kemudian ada doming sejak latest Early > Jurassic sampe ke Middle Jurassic, lalu domenya kolaps, ekstensi terjadi > lagi di Late Jurassic (Kimmeridge Clay diendapkan) sampe earliest > Cretaceous. > > Cerita multiple rifting ini mirip dengan yang di Otway basin selatannya > Victoria yah. Rifting pertama di kontinen, extensi kedua di marginal marine. > > Di situ ada papernya kok Mas, kalo Mas Vicky mau memburu marine synrift > source rock ini. > > min > > --------------------------------------------------------------------- To unsubscribe, send email to: iagi-net-unsubscribe[at]iagi.or.id To subscribe, send email to: iagi-net-subscribe[at]iagi.or.id Visit IAGI Website: http://iagi.or.id IAGI-net Archive 1: http://www.mail-archive.com/iagi-net%40iagi.or.id/ IAGI-net Archive 2: http://groups.yahoo.com/group/iagi Komisi Sedimentologi (FOSI) : Ratna Asharina (Ratna.Asharina[at]santos.com)-http://fosi.iagi.or.id Komisi SDM/Pendidikan : Edy Sunardi(sunardi[at]melsa.net.id) Komisi Karst : Hanang Samodra(hanang[at]grdc.dpe.go.id) Komisi Sertifikasi : M. Suryowibowo(soeryo[at]bp.com) Komisi OTODA : Ridwan Djamaluddin(ridwan[at]bppt.go.id atau [EMAIL PROTECTED]), Arif Zardi Dahlius(zardi[at]bdg.centrin.net.id) Komisi Database Geologi : Aria A. Mulhadiono(anugraha[at]centrin.net.id) --------------------------------------------------------------------- --------------------------------- Yahoo! Mail Use Photomail to share photos without annoying attachments.
