The Kuching Formation: A deep marine equivalent of the Sadong Formation, and its implications for the Early Mesozoic tectonic evolution of western and southern Borneo

Q3 Earth and Planetary Sciences Bulletin of the Geological Society of Malaysia Pub Date : 2023-11-30 DOI:10.7186/bgsm76202308
H. Breitfeld, S. Burley, T. Galin, Juliane Hennig-Breitfeld, Roslan Rajali
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Abstract

The pre-Cretaceous history of Borneo remains relatively poorly studied. Limited exposures of Palaeozoic and lower Mesozoic rocks are located in NW Kalimantan and in West Sarawak, an area interpreted as the West Borneo basement. Lower Mesozoic sedimentary rocks in West Sarawak were analysed to study their depositional environments and implications for the tectonic evolution. Upper Triassic turbidites in West Sarawak, exposed in the northern part of Kuching city, informally named the Kuching Formation, are the deep marine equivalent to the more widespread, shallow marine Sadong Formation. The Kuching Formation comprises thinly-bedded stacked turbidites, consisting of incomplete Bouma sequences, with multiple, erosive channel sandstone bodies deposited under upper flow regime waning flows. Thin debrites with abundant coaly-material are interbedded with the channel sandstones. The Kuching and Sadong formations both contain volcaniclastic detritus that was derived from the westward-subducting Palaeo-Pacific plate, forming a Triassic Andean-type arc which extended from West Borneo in the south to southern China, Taiwan and Japan in the north. Palaeoproterozoic to Archean detrital zircons in the Kuching and Sadong formations reveal a Cathaysian basement source, providing insights into the nature of the West Borneo basement. Quartz-mica schists (Kerait Schist, Tuang Formation) in fault-contact with the two sedimentary successions may have formed during accretion.
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古晋地层:与沙东地层相当的深海地层及其对婆罗洲西部和南部早中生代构造演化的影响
婆罗洲的前白垩纪历史研究相对较少。加里曼丹岛西北部和西沙捞越(该地区被解释为西婆罗洲基底)出露的古生代和下中生代岩石有限。对西沙捞越的下中生代沉积岩进行了分析,以研究其沉积环境及其对构造演化的影响。西沙捞越的上三叠统浊积岩出露于古晋市北部,被非正式地命名为古晋地层,相当于更广泛的浅海沙东地层的深海地层。古晋地层由薄层叠加浊积岩组成,由不完整的布玛(Bouma)层序组成,在上层流系减弱的水流作用下沉积了多个侵蚀性河道砂岩体。含有丰富煤质的薄层碎屑岩与河槽砂岩互层。古晋地层和沙东地层都含有火山碎屑,这些碎屑来自向西俯冲的古太平洋板块,形成了三叠纪安第斯型弧,从南面的西婆罗洲延伸到北面的中国南部、台湾和日本。古晋地层和沙东地层中的古新生代至新元古代的碎屑锆石揭示了华夏基底的来源,为了解西婆罗洲基底的性质提供了线索。与这两个沉积演替断层接触的石英云母片岩(Kerait片岩,Tuang地层)可能是在增生过程中形成的。
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来源期刊
Bulletin of the Geological Society of Malaysia
Bulletin of the Geological Society of Malaysia Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)
CiteScore
1.60
自引率
0.00%
发文量
15
期刊最新文献
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