Jurassic–Cretaceous terrestrial transition red beds in northernNorth China and their implication on regional paleogeography,paleoecology, and tectonic evolution
Jurassic–Cretaceous terrestrial transition red beds in northernNorth China and their implication on regional paleogeography,paleoecology, and tectonic evolution
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华北北部侏罗纪—白垩纪陆相过渡红层及其区域古地理、古生态和构造演化意义
DOI：
10.1016/j.palwor.2016.05.007
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
彭楠
中科院分区：
文献类型：
--
作者：
许欢;柳永清;旷红伟;刘燕学;彭楠
华北北方侏罗-白垩纪陆相过渡红层与古地理、生物过渡、构造演化等重大地质问题有关，至今仍存在争议。本文在前人研究的基础上，结合地层学、沉积学、物源、生物学、构造学等方面的最新研究进展，对华北北部地区以土城子组/后城组/大青山组（约1000米）为代表的红层进行了综合评述。154-137 Ma），并提供了一些新的观点。在15条实测剖面的基础上，划分出冲积扇相、河流相、三角洲相、湖泊相和风成相5个相单元。物源分析表明，红层为本地物源。东阴山-燕山造山带盆地内的矿床主要来源于中晚侏罗世跳鸡山组火山岩和盆地周边特别是北部的中元古界-早古生代碳酸盐岩、硅质岩和碎屑岩。而阴山-燕山造山带西部盆地的沉积物则主要由出露于盆地底部的新太古代-古元古代变质岩提供。不同地区的古水流特征显示出局部汇聚型古水系的特征，表明华北北方盆地发育了一系列相对独立的中小型盆地。形成于中侏罗世晚期的东西走向的阴山-燕山造山带，在侏罗纪-白垩纪过渡期先后隆升，构成华北北部的古地理高地。早白垩世早期风成沉积物的出现，反映了严重干热环境的退化，这可能是燕辽生物群消亡的一个重要因素。结合区域性晚侏罗世-早白垩世A型花岗岩、基性岩墙、变质核杂岩和裂谷盆地等，认为侏罗-白垩纪转换红层形成于受蒙古-鄂霍茨克造山带造山后塌陷控制的伸展构造环境。
2016AbstractThe Jurassic–Cretaceous terrestrial transition red beds in the northern North China Craton are associated with a number of major geologicalissues that remain controversial, such as paleogeography, biotic transition, and tectonic evolution. Based on previous studies and new progressrelated to stratigraphy, sedimentology, provenance, biotas, and tectonics, this paper performs a comprehensive review of the red beds in the northernNorth China Craton represented by the Tuchengzi/Houcheng/Daqingshan Formation (ca. 154–137 Ma) and offers some new perspectives. Basedon the 15 measured sections, five facies units including alluvial fan, fluvial, delta, lacustrine, and eolian facies have been recognized and describedin detail. Provenance analysis indicates that the red beds were derived from local sources. Deposits in the basins in the eastern Yinshan–Yanshanorogenic belt were derived mainly from volcanic rocks of the Middle–Late Jurassic Tiaojishan Formation and the Mesoproterozoic–Early Paleo-zoic carbonate, siliceous, and clastic rocks present around the basin, especially in the north. In contrast, sediments in the basins in the westernYinshan–Yanshan orogenic belt were provided predominantly by the Neoarchean–Paleoproterozoic metamorphic rocks exposed mainly in thenorth of the basin. Paleocurrent features in different regions show characteristics of a localized convergent paleo-drainage system, suggest-ing that a series of relatively independent small- to mid-scale basins developed in the northern North China Craton. The east–west-trendingYinshan–Yanshan orogenic belt, formed in the late Middle Jurassic, uplifted successively and constituted a paleogeographic highland in northernNorth China during the Jurassic–Cretaceous transition time. The presence of eolian deposits in the early Early Cretaceous indicates degradation ofthe severe arid and hot environment, which may have been an essential factor in the dying out of the Yanliao Biota. Combined with regional LateJurassic–Early Cretaceous A-type granites, mafic dykes, and metamorphic core complexes and rift basins, this suggests that the Jurassic–Cretaceoustransition red beds were formed in an extensional tectonic setting controlled by the post-orogenic collapse of the Mongol–Okhotskorogenic belt.