Tectonostratigraphic evolution of the Mohe-Upper Amur Basin reflects the final closure of the Mongol-Okhotsk Ocean in the latest Jurassic-earliest Cretaceous
Tectonostratigraphic evolution of the Mohe-Upper Amur Basin reflects the final closure of the Mongol-Okhotsk Ocean in the latest Jurassic-earliest Cretaceous
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漠河—上阿穆尔盆地构造地层演化反映了晚侏罗世—早白垩世蒙古—鄂霍茨克洋的最终闭合
DOI：
10.1016/j.jseaes.2017.06.020
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发表时间：
2017
影响因子：
3
通讯作者：
Hou Zhen-Hui
中科院分区：
文献类型：
--
作者：
Guo Zhi-Xin;Yang Yong-Tai;Zyabrev Sergey;Hou Zhen-Hui
位于蒙古-鄂霍次克缝合带东部南部的漠河-上阿穆尔盆地包含了重要的地层记录，有助于理解蒙古-鄂霍次克洋东部的闭合。该盆地被俄罗斯/中国边界穿过，其中国和俄罗斯部分分别被称为漠河盆地和上阿穆尔盆地。本文利用最新的地层学、沉积学、岩石学和碎屑锆石U-Pb年代学资料，建立了漠河盆地与上阿穆尔盆地的地层对比，分析了它们的侏罗纪-下白垩统地层的沉积时代、物源和古地理特征。将漠河盆地秀峰组、二十尔站组、额木尔河组和开库康组的中晚侏罗世年龄分别修订为Kimmeridgian晚期、Tithonian晚期、Berriasian-early Valanginian晚期和Valanginian晚期。在Kimmeridgian-Tithonian晚期，伸展作用发生在Mohe-上阿穆尔盆地，沉积物主要来自盆地南部地区。后来，在贝里阿斯期-瓦兰吉期早期，Mohe-上阿穆尔盆地的北方边缘被抬升并开始向盆地提供沉积物。晚Valanginian，漠河-上阿穆尔盆地的北方的区域性隆升使盆地转变为挤压山间盆地，其南部沉积局限。在Valanginian之后，伸展和相关的火山作用发生在盆地中。我们认为，漠河-上阿穆尔盆地的演化反映了东部蒙古-鄂霍次克洋的逐渐闭合以及西伯利亚板块和Amuria地块的碰撞，这一碰撞发生在从盆地西部的Kimmeridgian-Tithonian到盆地北部和东北部的Berriasian-Valanginian。早白垩世末漠河-上阿穆尔盆地以北蒙古-鄂霍次克洋的最终闭合对东北亚地区的沉积、构造和构造演化产生了重要影响。
The Mohe-Upper Amur Basin to the south of the eastern Mongol-Okhotsk Suture Zone contains important stratigraphic records for understanding the closure of the eastern Mongol-Okhotsk Ocean. The basin is crossed by the Russia/China border, and its Chinese and Russian parts are known as the Mohe Basin and Upper Amur Basin, respectively. Using most up-to-date data on stratigraphy, sedimentology, petrography, and detrital zircon U-Pb geochronology, this study establishes the stratigraphic correlation between the two, Mohe and Upper Amur parts of the basin, and analyzes depositional ages, provenance, and paleogeography of their Jurassic–Lower Cretaceous strata. The adopted Middle–Late Jurassic ages for the Xiufeng, Ershierzhan, Emuerhe, and Kaikukang formations in the Mohe Basin, are revised and constrained to late Kimmeridgian, Tithonian, Berriasian–early Valanginian, and late Valanginian ages, respectively. During the late Kimmeridgian–Tithonian, extension occurred in the Mohe-Upper Amur Basin, and sediments were mainly sourced from areas to the south of the basin. Later, in the Berriasian–early Valanginian, the northern margin of the Mohe-Upper Amur Basin was uplifted and started furnishing sediments into the basin. In the late Valanginian, regional uplift of the northern part of the Mohe-Upper Amur Basin transformed the basin into a compressional intermountain basin, with sedimentation localized in its southern part. After the Valanginian, extension and associated volcanism occurred in the basin. We suggest that the evolution of the Mohe-Upper Amur Basin reflects the gradual closure of the eastern Mongol-Okhotsk Ocean and associated collision of the Siberia Craton and the Amuria Block, that occurred from the Kimmeridgian–Tithonian, to the west of the basin through to the Berriasian–Valanginian, to the north and northeast of the basin. The final closure of the Mongol-Okhotsk Ocean to the north of the Mohe-Upper Amur Basin in the earliest Cretaceous significantly affected the sedimentological, structural and tectonic evolution of Northeast Asia.