Provenance Quartz sandstone mamber of Nanggulan Formation

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Provenance Quartz sandstone mamber of Nanggulan Formation

Postoleh RifaigeoBumi » Rab Apr 25, 2012 3:20 pm

Mungkin yg saya tanyakan terkait keberadaan batupasir kuarsa yg terdapat pada posisi di dapan busur magmatic resen, cth di daerah Kulonprogo,pacitan dan ada 4 lagi di daerah yg saya lpa lokasinya..
hal ini sedikit membingungkan saya terkait provenance kuarsa nya ???walaupun saya sdah coba memikirkan hal itu tp sangat sulit mkin hal ini terkait hal yg utama dlm geologi yaitu ruang dan waktu..
Diubah terakhir kali oleh RifaigeoBumi on Kam Jun 14, 2012 10:34 am, total pengubahan 1 kali.
RifaigeoBumi
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Re: Keberadaan Batupasir Kuarsa Depan Busur Magmatic resen

Postoleh koko_krunch86 » Rab Apr 25, 2012 11:14 pm

IMHO

Busur magmatik : Busur Gunung Api

http://atlasnasional.bakosurtanal.go.id ... Kalimantan

Saat ini/resen di jawa magmanya relatif andesitik (intermediet)

sehingga berdasarkan dengan sifatnya tersebut maka komposisi batuannya tersusun oleh mineral Plagioklas (dominan), kuarsa, Biotit, Amphibole.

http://www.google.co.id/imgres?imgurl=h ... Aw&dur=601

"mengapa ditemukan hanya kuarsa??"

hal ini dikarenakan tingkat resistensi mineral yang berbeda antara plagioklas, kuarsa, biotit dan amphibole.

http://www.google.co.id/imgres?q=bowens ... AAQ&zoom=1

pada bowen reaction series dapat dilihat bahwa semakin ke bawah akan menunjukan tingkat kestabilan mineral / ke resistensian mineral.

:mrgreen:

semoga bisa membantu *sekaligus saya inget" lagi pelajaran jaman dulu*

:mrgreen:

CMIIW
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Re: Keberadaan Batupasir Kuarsa Depan Busur Magmatic resen

Postoleh RifaigeoBumi » Kam Jun 14, 2012 10:32 am

Iya makasih saya mengerti akan penjelasannya tersebut terkait reisistensi dimana didasari bowen reaction series..hal lain yg masih membuat saya bertanya provenance kuarsanya kan jelas Formasi Nanggulan yg anggotanya salah satunya batupasir kuarsa yg saya tanyakan sebelumnya drimna mana asal kuarsanya jika di bilang volkanik jelas rencu, volkanik yg mana dulu OAF jelas berumur lebih muda dari Nanggulan..Kemudian jika Dari Continent cukup jauh jika kita melihat sundaland granitic continent yg sangat jauh di barat laut - utara..dan melihat posisinya yg sekarang berada di fore arc magmatic resent..bagaimana kontrol tektoniknya hingga batuan ini tersingkap di daerah nanggulan in...

maksih
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Re: Keberadaan Batupasir Kuarsa Depan Busur Magmatic resen

Postoleh Iqbal Fardiansyah » Sel Jun 19, 2012 8:01 am

RifaigeoBumi menulis:Iya makasih saya mengerti akan penjelasannya tersebut terkait reisistensi dimana didasari bowen reaction series..hal lain yg masih membuat saya bertanya provenance kuarsanya kan jelas Formasi Nanggulan yg anggotanya salah satunya batupasir kuarsa yg saya tanyakan sebelumnya drimna mana asal kuarsanya jika di bilang volkanik jelas rencu, volkanik yg mana dulu OAF jelas berumur lebih muda dari Nanggulan..Kemudian jika Dari Continent cukup jauh jika kita melihat sundaland granitic continent yg sangat jauh di barat laut - utara..dan melihat posisinya yg sekarang berada di fore arc magmatic resent..bagaimana kontrol tektoniknya hingga batuan ini tersingkap di daerah nanggulan in...

maksih


Dear refai,

Sedikit yang saya tahu tentang quartz sand Formasi Nanggulan, nanggulan merupakan salah satu jendela2 sediment Eocene di east java, selain Karangsambung, Formasi Bulukuning(prasetyadi,2005) dan Formasi Gamping-Wungkal yang ada di bayat dan terdiri atas quartz-rich sandstone yang mana absent dari kegiatan gunung api. quartz2 sandstone yang ada di east java ini memang awalnya diduga berasal dari S-E core of sundaland termasuk schawner block yang ada di kalimantan barat yang kaya akan granit. tetapi hasil dari penelitian helen symith,2005 , dia mengambil sample granit yang ada di schawner block coreny sundaland tersebut untuk dianalisis quartz dan zirconnya untuk di bandingkan dengan sediment Eocene tadi di east java. Tapi ternyata hasilnya missing brur, hasil zircon U-PB yang ada di schawner block itu umurnya keluar sekitar Late Cretaceous 78-89 Ma, dan umur tersebut tidak pernah ditemukan di butiran sediment di East Java. oleh sebab itu helen symth menduga adanya barrier yang berarah NE-SW termasuk kepulauan karimunjawa yang berorientasi ke pegunungan meratus yang membuat keduanya berbeda. hal tersebut dibuktikan mereka dari hasil analsisi zircon U-PB pada formasi yang langsung kontak dengan basement cretaceous di karangsambung dan hasilnya cocok dengan zircon2 yang berumur cretaceous di east java, dia berasumsi bahwa quartz-rich sandstone tersebut dari local source.selain itu symith menduga adanya volcanic clastic yang kaya akan quartz sand sebagai sumber provenance sediment2 Eocene tersebut brur.kamu bisa baca papernya helen smyth tentang east java,

*EAST JAVA: CENOZOIC BASINS, VOLCANOES AND ANCIENT BASEMENT
*Significant Volcanic Contribution to Some Quartz-Rich Sandstones, East Java, Indonesia

sedikit berbagi,

salam

ogep
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