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首页> 外文期刊>Journal of Asian earth sciences >Stratigraphy and tectonic setting of the Cretaceous and Paleogene volcanic-sedimentary successions in northwest Sulawesi, Indonesia: implications for the Cenozoic evolution of Western and Northern Sulawesi
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Stratigraphy and tectonic setting of the Cretaceous and Paleogene volcanic-sedimentary successions in northwest Sulawesi, Indonesia: implications for the Cenozoic evolution of Western and Northern Sulawesi

机译：印度尼西亚苏拉威西西北地区白垩纪和古近纪火山沉积沉积演替的地层和构造环境：对苏拉威西西部和北部新生代演化的影响

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摘要

New field and laboratory data from NW Sulawesi, Indonesia, integrated with existing information, provide a tectonostratigraphic framework for the Cretaceous and Paleogene of this region. The study area straddles two distinct provinces, referred to as 'Western' and 'Northern Sulawesi'. Western Sulawesi forms the (rifted) continental margin of eastern Sundaland. It consists of a metamorphic basement, partly of Australian origin, overlain by Late Cretaceous turbidites that were deposited in a fore-arc setting (Latimojong Formation). These are in turn covered by volcanic-sedimentary successions that were deposited during the early Middle Eocene to earliest Miocene. They represent a transgressive cycle from syn-rift siliciclastics, through nummulitic limestone and associated shelf sediments, to deeper marine mudstones and turbidites (Budungbudung and Tinombo Formations). During the same period Northern Sulawesi developed as an oceanic island arc, characterized by bimodal volcanism (Papayato Volcanics), founded on (back arc?) oceanic crust. The Cretaceous and Paleogene volcanic and sedimentary suites show lithological and geochemical characteristics that reflect the contrasting tectonic setting of the two provinces. The tectonic relationship between the two domains is not clear. They probably formed a more or less continuous belt throughout the Cenozoic, but were definitely connected not later than the early Miocene. Strong deformation in the Paleogene formations in the northern part of NW Sulawesi and their unconformable relationship with the overlying formations may be the result of the collision of the north arm of Sulawesi with a continental fragment, of Australian derivation, during the early Miocene, or it may be related to the formation of a metamorphic core complex in a mid-Miocene extensional tectonic setting. A second major tectonic event, which commenced in the Pliocene and is still ongoing, affected the entire region.
机译：来自印度尼西亚西北苏拉威西岛的新的野外和实验室数据与现有信息相结合，为该地区的白垩纪和古近纪提供了构造地层学框架。研究区域横跨两个不同的省份，分别称为“西部”和“北部苏拉威西省”。苏拉威西岛西部是Sun他兰东部的（裂谷）大陆边缘。它由一部分源自澳大利亚的变质基底组成，上面覆盖着沉积在前弧环境（拉提莫宗地层）中的晚白垩世浊积岩。这些反过来又被中新世早期至中新世早期沉积的火山沉积作用所覆盖。它们代表了一个从同裂谷质硅质碎屑到大量的石灰岩和相关的陆架沉积物，再到更深的海洋泥岩和浊石（Budungbudung和Tinombo地层）的海侵循环。在同一时期，北苏拉威西岛发展成一个海洋岛弧，其特征是建立在（后弧？）大洋壳上的双峰火山作用（Papayato火山）。白垩纪和古近纪的火山岩和沉积岩组合显示出岩性和地球化学特征，反映了两个省不同的构造环境。两个区域之间的构造关系尚不清楚。它们可能在整个新生代形成了一个或多或少连续的带，但肯定不晚于中新世才被连接起来。苏拉威西岛西北部古近系地层的强烈变形及其与上覆岩层的不整合关系，可能是由于苏拉威西岛北臂与中新世早期澳大利亚大陆衍生的碎片碰撞所致。可能与中新世中期伸展构造环境中变质核心复合物的形成有关。第二个主要的构造事件始于上新世，目前仍在持续，影响了整个地区。

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