Waduh, makin kisruh ini he he he. Sebagian besar marker Talangakar yang di pick di sumur, baik yang di onshore NW Java Basin ataupun di South Sumatra basin, setelah dibikin tie dengan seismic, sebagian besar justru jatuhnya di post rift section. Paleontologinya juga bilang marine. Nah ??? Mungkin termionologi "Talangakar" perlu dikembalikan ke lokasi type-nya. Umurnya apa, depositional environmentnya apa agar kalau kita bilang "Talangakar" itu apakah sebagai "Talangakar like facies/rock" atau "Talangakar time" atau bener-bener Talangakar sebagaimana yang dijumpai di lokasi typenya (dimana seh ini ??) Logis ndak ya, ada lithologi yang sampai nyebrang antar basin dan masih satu formasi ?? Jangan-jangan nanti Formasi Belut yang dijumpai di Natuna juga dibilang "Talangakar", biar laku dijual he he he ... toh sama-sama klastik, banyak kuarsanya, proximal, fan agglomerat, etc..etc... BSM
-----Original Message----- From: Ukat Sukanta [mailto:[EMAIL PROTECTED] Sent: Monday, June 06, 2005 10:00 AM To: iagi-net@iagi.or.id Subject: RE: [iagi-net-l] Talang Akar & syn-rift origin sands Mas Budi, Mungkin salah alamat, yang dimaksud Talang Akar ini sebetulnya di South Sumatra Basin, bukan di Central Sumatra. Kalau kita korelasikan dengan Central Sumatra, Talang Akar di South Sumatra itu ada (sebagian besar) dibawah SB 25.5 Ma, jadi equivalent dengan Pematang, Upper Red Beds-sand/conglomerate di Central Sumatra. Salam, US -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Monday, June 06, 2005 9:27 AM To: iagi-net@iagi.or.id Subject: Re: [iagi-net-l] Talang Akar & syn-rift origin sands Apakah yang dimaksud adalah Formasi Brani (?) di Central Sumatra Basin yang terletak di Lembah Harau Payakumbuh dengan singkapan pada faulted cliff dan cross bedding structure dg batuan conglomeratic sandstone dan ketebalan >30 meter. Outcrop tsb diyakini merupakan endapan Paleogene synrift ?? Atau another else ? [EMAIL PROTECTED] nesia.co.id To: <iagi-net@iagi.or.id> cc: iagi-net@iagi.or.id 03/06/2005 04:28 PM Subject: [iagi-net-l] Talang Akar & syn-rift origin sands Please respond to iagi-net Bapak-bapak dan ibu-ibu sadayana, Saya mau bertanya, Formasi Talang Akar yang dominan dengan cross cutting channels yang tersingkap di Central Sumatra itu dikatakan sebagai syn-rift sands. Yang ingin saya tanyakan, berapa ketebalan dari sandstone synrift tersebut? Seingat saya sand ini tersingkap di pinggir jalan dan terlihat di sebuah bukit, jadi ketebalannya lumayan signifikan (?30 meter) stacking channel sands. Minta tolong inputnya. Trims, Parvita H. Siregar Geologist-ENI Indonesia Kuningan Plaza, South Tower 9th Floor Jl. H.R. Rasuna Said Kav. 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