Tectonic evolution of the Bantimala Complex, South Sulawesi, Indonesia
Tectonic evolution of the Bantimala Complex, South Sulawesi, Indonesia
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DOI：
10.1144/gsl.sp.1996.106.01.23
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
K. Wakita;J. Sopaheluwakan;K. Miyazaki;I. Zulkarnain;Munasri
中科院分区：
文献类型：
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作者：
K. Wakita;J. Sopaheluwakan;K. Miyazaki;I. Zulkarnain;Munasri
摘要印度尼西亚南苏拉威西岛的班蒂马拉杂岩是一组向北东倾斜的构造叠置岩片。岩片主要由高压变质岩、放射虫硅质岩、角砾岩、砂岩和页岩以及混杂岩组成。为了了解班蒂马拉杂岩的构造演化，我们调查了岩性，年龄，地层，结构和组件的关系。高P低T变质岩石的K-Ar年龄表明，晚侏罗世或早白垩世有大洋板块俯冲到巽他大陆之下。阿尔布期俯冲作用停止，在中白垩世放射虫硅质岩沉积之前和沉积期间，高压片岩在地表被剥露和侵蚀。这些片岩的折返作用与冈瓦纳古陆的微大陆碰撞有关。班蒂马拉杂岩中的侏罗纪浅海沉积岩可能是碰撞后的微大陆的残留碎块。班蒂马拉杂岩的构造叠加是由晚第三纪的俯冲和另一个大陆碎片进一步向东碰撞造成的。
Abstract The Bantimala Complex of South Sulawesi, Indonesia is an assemblage of northeast-dipping tectonically stacked slices. The slices consist mainly of high pressure metamorphic rocks, radiolarian chert, breccia, sandstone and shale, and melange. In order to understand the tectonic evolution of the Bantimala Complex, we have investigated the lithology, age, stratigraphy, structure and relationships of the components. The K-Ar ages of high P-low T metamorphic rocks suggest that an oceanic plate subducted beneath the Sundaland continent during the Late Jurassic or earliest Cretaceous. The subduction ceased during the Albian, and the high pressure schists were exhumed and eroded at the surface before and during the deposition of middle Cretaceous radiolarian chert. The exhumation of the schists was related to the collision of microcontinents derived from Gondwanaland. The Jurassic shallow marine sedimentary rocks in the Bantimala Complex are possibly remnant fragments of the collided microcontinent. Tectonic stacking of the Bantimala Complex was caused by Neogene subduction and collision of another continental fragment further to the east.