{"id":"2afcb38f-6de0-4063-80bf-2119a8fb53b2","title":"羌塘地块白垩纪锆石(U—Th)/He年龄数据","title_en":"Zircon (U-Th) / He age data of Cretaceous denudation cooling events in the Qiangtang block","serial":"","user_limit":"为尊重知识产权、保障数据作者的权益、扩展数据中心的服务、评估数据的应用潜力，请数据使用者在使用数据所产生的研究成果中（包括公开发表的论文、论著、数据产品和未公开发表的研究报告、数据产品等成果），明确注明数据来源和数据作者。对于转载（二次或多次发布）的数据，作者还须注明原始数据来源。","instructions":"数据以Word格式存储，文件名称以QT为开头，代表羌塘盆地。具体样品编号、实验方法、具体数据等见Word。","description":"样品为羌科-1井、羌地-17井和羌资-16井。分析测试工作在中国科学院地质与地球物理研究所氩氩、铀—钍—氦年代学实验室完成，测试方法见吴林等(2016)。取得成果如下：青藏高原内部羌塘地块三个钻孔岩芯中9件样品的锆石(U—Th)/He年龄，除始新统两件样品的锆石(U—Th)/He热史信息尚未重置外，其余样品年龄均集中在白垩纪，且年龄值随高程变化较小，指示存在白垩纪剥蚀—冷却。 羌塘地块西部 QD-17 井记录了早白垩世(约127~114Ma)的剥蚀—冷却，东部QZ-16井记录了晚白垩世(约92~64Ma)的剥蚀—冷却。 白垩纪剥蚀—冷却得到区域上低温热年代学数据统计和构造—沉积事件的响应。 羌塘地块、拉萨地块和喜马拉雅地块的低温热年代学数据统计结果显示，拉萨地块北部和羌塘地块(高原内部)广泛分布白垩纪—早始新世的低温热年代学年龄，拉萨地块南部至喜马拉雅地块(高原南缘)则广泛分布晚中新世以来的低温热年代学年龄，这种年龄分布格局暗示高原内部和南缘经历了明显不同的剥蚀—冷却历史。参考高原南缘晚中新世以来的快速剥蚀—冷却过程，推测高原内部也存在白垩纪快速剥蚀—冷却事件。 拉萨地块北部、羌塘地块及其以北区域广发出现早白垩世沉积间断及沉积不整合，也指示白垩纪期间的快速剥蚀。结合区域构造演化分析，该白垩纪剥蚀—冷却可能是早白垩世班公湖—怒江洋关闭后拉萨地块与羌塘地块碰撞的结果，指示在新生代印度—欧亚大陆碰撞之前，高原内部的地壳可能已经存在明显的缩短、加厚变形以及相应的剥蚀—冷却。","doi":"10.11888/Geo.tpdc.271469","projection":"","language":"zh","share_type":"online","east":93.0,"west":79.0,"south":26.0,"north":35.0,"scale":null,"crs":null,"filesize":0.5,"share_policy":"a","ts_created":"2021-06-01T16:25:07.908182+08:00","doi_type":"拥有自主知识产权","ts_updated":"2021-06-20T11:04:28.540545+08:00","time_description":"100百万年来","datas_group":3,"time_description_en":"For 100 million years","data_format":null,"project":[11],"specials":["b6500306-f60b-4aa1-b0b6-0324d94866df"],"cite":null,"review_status":5,"review_invite":[{"user_name":"颜茂都","username":"颜茂都","email":"maoduyan@itpcas.ac.cn","is_cancel_expert":true}],"review_editor":{"id":66424,"last_login":"2021-08-31T17:09:37.293773+08:00","username":"YanHou","email":"ljz2hy@163.com","is_active":false,"is_staff":false,"user_name":"侯燕"},"data_sources":null,"temporal_resolution":"1000 year < x","spatial_resolution":"100km - 1000km","license":"Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)","fund":[21],"subtopics":{"metadata":"2afcb38f-6de0-4063-80bf-2119a8fb53b2","three_pole":null,"third_pole":null},"username":"韩中鹏","review_time":null,"protected_duration":null,"protected_describe":null,"is_important":false,"hit_count":626}