ANOMALI  GAYA BERAT DAN TATAAN TEKTONIK  SEKITAR PERAIRAN LAUT BANDA DAN PULAU SERAM

Budi Setyanta; Imam Setiadi

doi:10.33332/jgsm.geologi.v17i6.319

Authors

Budi Setyanta Pusat Survei Geologi
Imam Setiadi Pusat Survei Geologi

DOI:

https://doi.org/10.33332/jgsm.geologi.v17i6.319

Abstract

Bouguer and free air gravity anomaliesÂ of theÂ Banda Sea and Seram Island are divided into southren, central and northern parts. Gravity analyses based on land measurementÂ combinedÂ with ftee air anomaly data of the sea produce crust structure model which close related to rock composition and tectonic position.Â Crust structure at Banda Sea is mainly composed of basaltic crust ofÂ Banda Sea as a base and folded occurrence, collision with granitic crust border (Australian continent fragmentÂ ?).Â Banda Sea basalticÂ crust is underlying volcanic sedimentÂ BandaÂ Island, while granitic crust is underlying Pre-Tertiary sediment rock at Seram Island. Collision which happened since early Pliocene of two different crust has caused many things such as material from many sources in Seram Island mad melangeÂ rock and thrust fault that appeared in the surface. Tectonic intensity has also caused some granitic crust borders to get fragmentation which reduces value of the anomaly. Further-more, it appears volcanic rock of Â Banda Sea has caused gravity tectonicÂ toward equilibrium process basalticÂ crust. This geodynamic crustÂ Â model has an implicationÂ to geological Potency product, both in economic or disaster risk.

Keywords: gravity, tectonic, evolution, geological potency

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