Setuju influx sedimen dari Central Borneo Range dimulai dari Early Miocene keseluruh sirkum Borneo, makanya di W Borneo ada delta-delta tua berumur Late Oligocene-Early Miocene (Crocker dan Rajang Delta??), dan mungkin di East Kal ini source sediment untuk Delta yg disebut proto-Mahakam, cmiiw.
Kalau mas Iwan punya paper yg menunjukkan puncak influx sediment di Mid Miocene boleh dong minta :) Paper Clay&Ferguson dan banyak dari SEARG nya Robert Hall menunjukkan provenance Middle and Late Miocene delta-delta di sekitar sirkum Borneo berasal dari recycled orogenic belt, jadi bukan directly dari Kuching High atau Crocker Range, melainkan kanibalisasi delta-delta tua yang ada sebelumnya. Clay & Ferguson juga menyatakan adanya basin inversion di East Kal akibat NW Borneo-Palawan collision di Mid Miocene (di NW Borneo ini dikenal sebagai Mid-Miocene Unconformity) dan berakselerasi (puncaknya?) di 10Ma (Early Late Miocene). Ini yg sering dikutip sebagai Upper Miocene uplift, yang menyebabkan point source delta-delta di sepanjang East Kal terkonsentrasi di sekitar Mahakam delta seperti yg kita kenal sekarang. cmiiw. Salam, Herry ----- Original Message ---- From: Iwan B <[EMAIL PROTECTED]> To: iagi-net@iagi.or.id Sent: Thursday, 22 February, 2007 8:59:33 AM Subject: Re: [iagi-net-l] Delta East Kalimantan sepakat sekali Fer, influx sediment memang mulai sejak early/lower miocene, dan mencapai puncaknya di middle miocene, jadi upliftnya harusnya lebih tua dari early miocene dan bukan upper miocene ya? On 2/21/07, Ferry Bastaman Hakim <[EMAIL PROTECTED]> wrote: > Mas Iwan, > > Sebenarnya ada beberapa paper yang menyebutkan pengangkatan Central > Range Borneo atau yg biasa kita kenal sbg Kucing High itu sejak Late > Oligocene, tetapi memang kebanyakan merujuk pada periode Early Miocene > karena memang baru pada Early Miocene, Kucing High mulai efektif menjadi > provenance sedimen di sirkum Borneo, termasuk Mahakam Delta. > > Tetapi sebenarnya sebelum Kucing high terangkat-pun, Borneo sudah punya > Meratus High di selatan dan Mangkalihat Ridge di utara yg bisa jadi > sediment source-nya Kutei. Artinya gak menutup kemungkinan bahwa ada > deltaic sediment yang lebih tua dari Early Miocene. > > Semoga bermanfaat, > Ferry > > -----Original Message----- > From: Iwan B [mailto:[EMAIL PROTECTED] > Sent: Wednesday, February 21, 2007 2:37 PM > To: iagi-net@iagi.or.id > Subject: Re: [iagi-net-l] Delta East Kalimantan > > Kok agak bingung ya, kalau delta Mahakam baru terbentuk setelah uplift > Upper miocene.....sebenarnya delta mahalakam yang mana ya??? setahu > saya delta mahakam (terutama yang lower kutei) sudah ada sejak early > miocene, dan upliftnya sendiri bukannya lebih tua dari upper miocene > (Kucing High ??) > > > > On 2/21/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > Maaf ralat,...setuju,... pada Mid Miocene sepanjang pengetahuan saya > ada > > tiga delta yang aktif Sepinggan, Mahakam dan Sangata, pada uplift > Upper > > Miocene point source ke Mahakam. > > > > > > > > Herry Maulana > > <[EMAIL PROTECTED] > > oo.com> > To > > iagi-net@iagi.or.id > > 02/21/2007 01:04 > cc > > PM > > > Subject > > Re: [iagi-net-l] Delta East > > Please respond to Kalimantan > > <[EMAIL PROTECTED] > > .id> > > > > > > > > > > > > > > > > > > Sepinggan Delta masih lebih tua (Mid Miocene) dari Mahakam delta, > ekivalen > > dengan paleo-delta nya Mbak Parvita (Sangatta, Tarakan). > > > > cmiiw, uplift Upper Miocene menyebabkan semua point source beralih ke > > Mahakam Delta sampai saat ini, sehingga kecil kemungkinan ada delta > lain > > yang ekivalen dengan Mahakam Delta. Yang persis seumur dan mirip > > kejadiannya mungkin ada di NW Borneo, dimana paleo-delta (lebih tua > dari > > Mid-Upper Miocene) berada di NW Borneo sedikit lebih utara dibanding > Baram > > Delta (misal: Erb, Champion Delta) kemudian point source nya berubah > karena > > pengangkatan Upper Miocene sehingga terkonsentrasi di Baram Delta > sampai > > saat ini. > > > > Regards, > > Herry > > > > ----- Original Message ---- > > From: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> > > To: iagi-net@iagi.or.id > > Sent: Wednesday, 21 February, 2007 12:09:49 PM > > Subject: Re: [iagi-net-l] Delta East Kalimantan > > > > > > Sepinggan delta yang sekarang jadi estuari Balikpapan. > > > > > > > > > > "Parvita Siregar" > > <parvita.siregar@ > > salamander-energy > To > > .com> <iagi-net@iagi.or.id> > > > cc > > 02/21/2007 11:26 > > AM > Subject > > [iagi-net-l] Delta East > Kalimantan > > > > Please respond to > > <[EMAIL PROTECTED] > > .id> > > > > > > > > > > > > > > Rekan-rekan sekalian, > > > > > > > > Sejauh ini, delta yang paling populer di East Kalimantan adalah > Mahakam > > Delta system. Selain itu, ada juga delta2 yang ukurannya lebih kecil > > seperti Sangatta dan Tarakan (paleo-delta). Pertanyaan saya, apakah > ada > > lagi delta system lain di sepanjang East Kalimantan yang diakibatkan > > oleh uplift Upper Miocene di Kalimantan? Mustinya dengan uplift yang > > sebesar itu, terjadi juga delta2 lain yang cukup signifikan di East > Kal. > > > > > > > > > > Parvita H. Siregar > > > > > > > > > > > > > > > > > > > > Disclaimer: This email (including any attachments to it) is > confidential > > and is sent for the personal attention of the intended recipient only > > and may contain information that is privileged, confidential or exempt > > from disclosure. If you have received this email in error, please > > advise us immediately and delete it. 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