贵州赤水地区晚白垩世古流向特征及构造意义
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摘要
贵州赤水地区位于四川盆地西南缘,晚白垩世时期该地区沉积了一套厚达1300m的陆相地层。本文通过地表露头的古流向野外观测和室内分析,详细研究赤水地区晚白垩世沉积充填过程及构造意义。赤水地区晚白垩世早期辫状河的古流向为自北东向南西,表明碎屑物源主要来自盆地北侧和东侧。根据物源、地层分布及区域地质背景推断,赤水地区晚白垩世的陆相沉积盆地属于陆内前陆盆地,陆内造山带位于盆地东侧。晚白垩世陆内前陆盆地的形成,可能受控于此阶段华南的构造挤压事件形成的陆内造山作用。
A succession of 1300-m thick continental strata was deposited during the Late Cretaceous in the Chishui region, Guizhou on the southwestern margin of the Sichuan Basin. In this paper, the Late Cretaceous sediments filling processes and tectonic significance are explored on the basis of field observation and indoor analysis of the palaeocurrents indicated by the surface outcrops in the Chishui region. The palaeocurrents in the braided streams were directed from northeast to southwest during the Late Cretaceous, indicating that the sediments detritus in the Chishui region may come mainly from the northern and eastern parts of the Basin. Judged from the provenance, stratigraphic distribution and regional geological background, it is inferred that the Late Cretaceous continental sedimentary basin in the Chishui region may belong to the intracontinental foreland basin, and the intracontinental orogenic zones appear in the eastern part of the Basin as a major provenance. The formation of the Late Cretaceous intracontinental foreland basin in the Chishui region may be governed by the intracontinental orogeny caused by the tectonic compression events in South China during the Late Cretaceous, and thus the Sichuan Basin has gone through the evolution from a fresh lake to a saline lake.
A succession of 1300-m thick continental strata was deposited during the Late Cretaceous in the Chishui region, Guizhou on the southwestern margin of the Sichuan Basin. In this paper, the Late Cretaceous sediments filling processes and tectonic significance are explored on the basis of field observation and indoor analysis of the palaeocurrents indicated by the surface outcrops in the Chishui region. The palaeocurrents in the braided streams were directed from northeast to southwest during the Late Cretaceous, indicating that the sediments detritus in the Chishui region may come mainly from the northern and eastern parts of the Basin. Judged from the provenance, stratigraphic distribution and regional geological background, it is inferred that the Late Cretaceous continental sedimentary basin in the Chishui region may belong to the intracontinental foreland basin, and the intracontinental orogenic zones appear in the eastern part of the Basin as a major provenance. The formation of the Late Cretaceous intracontinental foreland basin in the Chishui region may be governed by the intracontinental orogeny caused by the tectonic compression events in South China during the Late Cretaceous, and thus the Sichuan Basin has gone through the evolution from a fresh lake to a saline lake.
引文
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[20] 金之钧,龙胜祥,周雁,等.中国南方膏盐岩分布特征[J].石油与天然气地质,2006,27(5):571-583.
[21] 金之钧,汤良杰,杨明慧,等.陆缘和陆内前陆盆地主要特征及含油气性研究[J].石油学报,2004,25(1):8-12.
[22] 崔建军,张岳桥,董树文,等.华南陆缘晚中生代造山及其地质意义[J].中国地质,2013,40(1):86-105.
[2] 郭正吾,邓康龄,韩永辉,等.四川盆地形成与演化[M].北京:地质出版社,1996.
[3] 四川省地质矿产局.四川省区域地质志[M].北京:地质出版社,1991.
[4] Burchfiel B C,Chen Z L,Liu Y P,et al.Tectonics of the Longmen Shan and adjacent regions,central China[J].International Geology Review,1995,37(8):661-735.
[5] 王二七,孟庆任.对龙门山中生代和新生代构造演化的讨论[J].中国科学:地球科学,2008,38(10):1221-1233.
[6] Richardson N J,Densmore A L,Seward D,et al.Extraordinary denudation in the Sichuan Basin:Insights from low-temperature thermochronology adjacent to the eastern margin of the Tibetan Plateau [J].Journal of Geophysical Research,2008,113(B4)B04409.
[7] Tian Y,Kohn B P,Zhu C,et al.Post-orogenic evolution of the Mesozoic Micang Shan Foreland Basin system,central China [J].Basin Research,2012,24(1):70-90.
[8] 杨国臣,于炳松,陈建强,等.川西盆地下白垩统古流向逆变及沉积地球化学响应[J].古地理学报,2010,12(1):116-126.
[9] 曾允孚,李勇.龙门山前陆盆地形成与演化[J].矿物岩石,1995,(1):40-49.
[10] 陈杨,赵霞飞,刘树根,等.四川盆地西部海相碎屑岩-陆相碎屑岩的转换过程[J].成都理工大学学报(自然科学版),2009,36(6):697-705.
[11] Yan Z,Tian Y,Li R,et al.Late Triassic tectonic inversion in the upper Yangtze Block:Insights from detrital zircon U-Pb geochronology from south-western Sichuan Basin [J].Basin Research,2019,31(1):92-113.
[12] 四川省地质矿产局.全国地层多重划分对比研究四川省岩石地层[M].武汉:中国地质大学出版社,1997.1-417.
[13] 李霞,董颖,李采,等.贵州赤水丹霞国家地质公园内地质遗迹特征及资源评价[J].中国地质灾害与防治学报,2013(1):118-125.
[14] 周立夫,陈孔全,唐永,等.川南綦江-赤水地区晚燕山期以来差异构造变形[J].地质科技情报,2016,35(4):66-73.
[15] 颜丹平,邱亮,陈峰,等.华南地块雪峰山中生代板内造山带构造样式及其形成机制[J].地学前缘,2018,25(1):1-13.
[16] Li Y,He D,Chen L,et al.Cretaceous sedimentary basins in Sichuan,SW China:Restoration of tectonic and depositional environments [J].Cretaceous Research,2016,57:50-65.
[17] Li J,Dong S,Cawood P A,et al.An Andean-type retro-arc foreland system beneath northwest South China revealed by SINOPROBE profiling [J].Earth and Planetary Science Letters,2018,490:170-179.
[18] Potter P E,Pettijohn F J.Paleocurrents and basin analysis [M].Springer-Verlag,1977.
[19] 王成善,李祥辉,赵锡奎,等.沉积盆地分析原理与方法[M].北京:高等教育出版社,2003.
[20] 金之钧,龙胜祥,周雁,等.中国南方膏盐岩分布特征[J].石油与天然气地质,2006,27(5):571-583.
[21] 金之钧,汤良杰,杨明慧,等.陆缘和陆内前陆盆地主要特征及含油气性研究[J].石油学报,2004,25(1):8-12.
[22] 崔建军,张岳桥,董树文,等.华南陆缘晚中生代造山及其地质意义[J].中国地质,2013,40(1):86-105.
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