Late Artinskian-Early Kungurian (Early Permian) warming and maximum marine flooding in the East Gondwana interior rift, Timor and Western Australia, and comparisons across East Gondwana
Late Artinskian-Early Kungurian (Early Permian) warming and maximum marine flooding in the East Gondwana interior rift, Timor and Western Australia, and comparisons across East Gondwana
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DOI：
10.1016/j.palaeo.2016.11.051
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发表时间：
2017-02-15
影响因子：
3
通讯作者：
Dos Santos, Zelia
中科院分区：
文献类型：
--
作者：
Haig, David W.;Mory, Arthur J.;Dos Santos, Zelia
关于东帝汶的上阿丁斯基-昆古里期矿床以及西澳大利亚的坎宁盆地、南卡马尔冯盆地和珀斯北部盆地，提供了大量新的信息。这些盆地位于古纬度约35度的S和55度的S之间，构成了东冈瓦那内部裂谷的一部分，是该地区后来形成印度洋的裂谷的前兆。帝汶岛位于东冈瓦那内部裂谷的主轴附近，而西澳大利亚的盆地是裂谷轴的边缘展布。主要的沉积中心是在宾夕法尼亚晚期启动的断层作用的结果。对新发现的东帝汶Bua-bai灰岩和Cribas群、Canning盆地Noonkanbah组、Camarvon盆地南部Merlinleigh次盆地的Byro群和Perth盆地北部的Caryngiia组进行了详细的岩石地层学和生物地层学分析。在帝汶岛，断层活动严重破坏了这一继承性，它是在开阔的海洋条件下沉积的，很可能是在陆架盆地的环境中。有限的极浅水海淹没了南卡纳冯盆地和珀斯盆地北部的坎宁盆地和梅林利-比罗-欧文次盆地，具有典型的河口环境中典型的氧气水平和盐度变化。在所有研究的盆地中都发现了类似的变暖和水深变化模式。在阿丁斯基晚期早期，寒冷的条件占上风，水温0-4摄氏度在梅林利-比罗-欧文裂谷形成海冰。阿尔廷斯基晚期的快速变暖伴随着靠近阿尔廷斯基-昆古尔期边界的最大海洋洪水。气候和水深条件允许裂谷系统北部发育碳酸盐丘，具有较大的丝状物和多种藻类，具有特提斯亲和力的管植物、牙形刺和腕足类迁移到边缘裂谷盆地，尽管这些沉积地点的水质通常很差。东冈瓦那内部裂谷的地层记录与拉萨和西布玛苏的同世记录对比表明，在石炭纪至西苏拉纪末期，气候变化模式相似。类似的趋势可能出现在东澳大利亚，尽管有些单位的相关性令人困惑。皇冠版权所有(C)2016由爱思唯尔出版。保留所有权利。
Substantial new information is presented on upper Artinskian-Kungurian deposits in Timor-Leste and in the Canning, Southern Camarvon and northern Perth basins of Western Australia. These basins, situated between about 35 degrees S and 55 degrees S palaeolatitude, formed part of the East Gondwana interior rift, a precursor to the rift that 100 my later formed the Indian Ocean in this region. Timor lay near the main axis of the East Gondwana interior rift, whereas the Western Australian basins were marginal splays from the rift axis. The main depocentres developed as a result of faulting that was initiated during the Late Pennsylvanian. Detailed lithostratigraphic and biostratigraphic analyses have been made on the newly recognized Bua-bai limestone and the type Cribas Group in Timor, the Noonkanbah Formation in the Canning Basin, the Byro Group in the Merlinleigh Sub-basin of the Southern Camarvon Basin, and the Carynginia Formation in the northern Perth Basin. In Timor the succession, which is highly disrupted by faulting, was deposited under open-marine conditions probably in a shelf-basin setting. Restricted, very shallow-water seas flooded the Canning Basin and the Merlinleigh-Byro-Irwin sub-basins of the Southern Carnarvon and northern Perth basins and had highly variable oxygen levels and salinities typical of estuarine environments.A similar pattern of warming and bathymetric change is recognized in all studied basins. During the early part of the late Artinskian cool conditions prevailed, with water temperatures 0-4 degrees C forming sea ice in the Merlinleigh-Byro-Irwin rift. Rapid warming during the latter part of the late Artinskian was accompanied by maximum marine flooding close to the Artinskian-Kungurian boundary. Climatic and bathymetric conditions then allowed carbonate mounds, with larger fusulines and a variety of algae, to develop in the northern part of the rift system, and Tubiphytes, conodonts, and brachiopods with Tethyan affinities to migrate into the marginal-rift basins despite the generally adverse water quality at these depositional sites.Comparison between the stratigraphic record from the East Gondwana interior rift and coeval records from Lhasa and Sibumasu indicate a similar pattern of climate change during the Carboniferous to end Cisuralian. Similar trends probably are present in Eastern Australia although there is confusion over the correlation of some units. Crown Copyright (C) 2016 Published by Elsevier B.V. All rights reserved.