印度尼西亚苏拉威西岛帕卢地层的锆英石和重矿物来源:帕卢变质复合体隆升和排水演化的制约因素

A. M. S. Nugraha, Juliane Hennig-Breitfeld, Riska Puspita, Adam D. Switzer, Robert Hall
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摘要

帕卢地层以前被称为帕卢地区的西里伯斯摩拉斯地层(Celebes Molasse),该地层研究不足,以前被认为与源自澳大利亚的小大陆--邦加苏拉--和巽他兰(西苏拉威西)东缘之间的上新世碰撞有关。在此,我们展示了沉积学、重矿物学和锆石地质年代学数据,以深入了解沉积物的来源,并阐明苏拉威西岛的新近纪构造活动。这些分析表明,更新世帕卢地层包括同源冲积扇至辫状河沉积,记录了苏拉威西岛颈部和中西部变质岩和花岗岩的快速隆升。帕卢地层的主要特征是花岗岩和变质岩碎屑以及以辉石、闪石和石榴石为主的重矿物组合。碎屑锆石记录的最年轻晶粒年龄约为 2.5 和 3.0 Ma,其中有大量上新世年龄群和附属的始新世、白垩世、侏罗纪和晚三叠世年龄峰。与造山运动相关的快速隆起和侵蚀塑造了地形,并影响了帕卢河网的演变。 专题文集:本文是中生代和新生代构造、地貌和气候变化文集的一部分,可在以下网址查阅: https://www.lyellcollection.org/topic/collections/mesozoic-and-cenozoic-tectonics-landscape-and-climate-change 补充材料: https://doi.org/10.6084/m9.figshare.c.7033388
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Detrital zircon and heavy mineral provenance from the Palu Formation, Sulawesi, Indonesia: constraints on exhumation of the Palu Metamorphic Complex and drainage evolution
The Palu Formation, previously known as the Celebes Molasse in the Palu area, is understudied and was previously considered to be associated with the Pliocene collision between an Australian-derived micro-continent – Banggai Sula– and the eastern margin of Sundaland (West Sulawesi). Here, we present sedimentological, heavy mineral, and zircon geochronological data to provide insights into sediment provenance and to elucidate Neogene tectonic activity in Sulawesi. These analyses suggest that the Pleistocene Palu Formation comprises syn-orogenic alluvial fan to braided river deposits that record the rapid uplift of metamorphic and granitoid rocks in the Neck and west Central Sulawesi. The Palu Formation is characterised by predominant granitoid and metamorphic clasts and heavy mineral assemblages dominated by pyroxene, amphibole, and garnet. Detrital zircons record youngest grain ages of ca. 2.5 and 3.0 Ma with a significant Pliocene age population and subsidiary Eocene, Cretaceous, Jurassic, and Late Triassic age peaks. Rapid uplift and erosion associated with mountain building shaped the topography and influenced the evolution of Palu River networks. Thematic collection: This article is part of the Mesozoic and Cenozoic tectonics, landscape and climate change collection available at: https://www.lyellcollection.org/topic/collections/mesozoic-and-cenozoic-tectonics-landscape-and-climate-change Supplementary material: https://doi.org/10.6084/m9.figshare.c.7033388
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