| 白培荣,杨育慎,曾禹人,李月森,马德胜,樊洪富.西藏恐弄拉地区中侏罗统桑卡拉佣组的厘定及其地质意义[J].贵州地质,2016,33(4):289-294,299 |
| 西藏恐弄拉地区中侏罗统桑卡拉佣组的厘定及其地质意义 |
| Determination and Its Geological Significance of Sangkalayong Formation of the Middle Jurassic in Kongnongla Area,Tibet |
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| DOI： |
| 中文关键词: 恐弄拉地区 中侏罗世 桑卡拉佣组 中生代盆地 |
| 英文关键词:Kongnongla area Middle Jurassic Sangkalayong formation Mesozoic Basin |
| 基金项目:中国地质调查局项目《西藏1∶5万恐弄拉地区四幅区域地质调查》（项目编号：12120114062301）。 |
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| 中文摘要: |
| 贵州省地质调查院在开展西藏自治区1∶5万班戈县恐弄拉地区区域地质调查时，在马前乡恐弄拉西侧车尖西南一带前人划分的一套早白垩世桂牙岩组碳酸盐岩地层中采集了腕足类和腹足类化石，据采集的古生物化石时代确定此套碳酸盐岩地层为中侏罗世沉积（晚巴柔期—卡洛期），通过岩石组合特征、基本层序、沉积环境及生物化石时代对比，将该套地层重新厘定为桑卡拉佣组。这一地层的确定为冈底斯带地层区侏罗系地层划分对比、地层格架建立提供了重要的依据，并为中生代盆地的演化历史，古地理轮廓的确定提供了新的基础资料。 |
| 英文摘要: |
| During the regional geological survey of 1∶50000 kongnongla area in Bange County in the Tibet Autonomous region carried out by Guizhou Geological Survey, the brachiopod and gastropod fossils were collected in the carbonate rocks of the Guiyayan Formation of a set of early Cretaceous strata classificated by predecessor in the region of southwestern of Chejian,which is in the west of Kongnongla in Maqian Township. The carbonate rocks were identified as Middle Jurassic(late Bajocian stage - Carlos) sediments according to the collected fossils age. The strata were redefined to be Sangkalayong Formation through comparison of rock assemblage, basic sequence, sedimentary environment and fossil age. Determination of the stratigraphic strata provides essential basis for stratigraphic division and correlation,framework establishment of Jurassic in the Gangdese belt.And provides new basic data for the evolution of the Mesozoic basins and the determination of the paleogeographic profile. |
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