PERAN SISTEM TUNJAMAN, SESAR MENDATAR TRANSFORM DAN PEMEKARAN TERHADAP SEBARAN CEKUNGAN SEDIMEN DI INDONESIA
DOI:
https://doi.org/10.33332/jgsm.geologi.v14i4.75Abstract
Berdasarkan umurnya, cekungan sedimen di Indonesia dapat dibedakan menjadi cekungan pra-Tersier, cekungan berumur menerus pra-Tersier – Tersier, dan cekungan Tersier. Indonesia bagian barat didominasi oleh cekungan Tersier, sementara Indonesia bagian timur didominasi oleh cekungan yang berkembang sejak Zaman pra-Tersier sampai Tersier. Baik berdasarkan umurnya maupun berdasarkan pola sebarannya, keberadaan cekungan – cekungan tersebut merepresantasikan pola perkembangan tektonik. Di wilayah bagian barat Indonesia pola sebaran cekungan berpola semi konsentris tampak mendominasi wilayah ini, dan ini dikontrol oleh evolusi sistem tunjaman. Sementara di bagian timur Indonesia hanya di wilayah Busur Banda dicirikan oleh sebaran cekungan berpola semi konsentris, dan selebihnya umumnya berpola acak, kecuali daerah yang dipengaruhi pemekaran dan tunjaman selain Busur Banda. Sebaran berpola acak ini terutama dikontrol oleh keberadaan sesar-sesar mendatar transform yang menjadi mediasi transportasi benua renik yang berasal dari Australia.
Kata kunci: Tunjaman, sesar transform, pemekaran, cekungan sedimen
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