{"id":"e5268e12-9dab-47a4-b5e4-fd790ecf0a44","title":"西藏中部羌塘地体晚白垩世高分异I型花岗岩的岩石成因和构造意义","title_en":"Petrogenesis and tectonic implications of Late Cretaceous highly fractionated I-type granites from the Qiangtang block, central Tibet.","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，文件名称为CBR开头，代表处布日地区。具体样品编号、实验方法、具体数据等见Word。","description":"拉萨-羌塘地体的碰撞以及随后的构造演化过程被认为是新生代印度-亚洲碰撞之前青藏高原的最重要的事件。针对这一科学问题，通过对羌塘地体安多地区的晚白垩世花岗岩研究，取得了以下成果和认识。对处布日花岗岩开展了锆石U-Pb年代学分析，主微量地球化学以及Sr-Nd同位素分析。两个样品的锆石U-Pb结果显示形成时代为73-74 Ma。地球化学数据显示岩浆岩具有高的SiO2，K2O，Na2O，Al2O3和全碱含量，属于高钾钙碱性的花岗岩系列。球粒陨石标准化的稀土元素图和原始地幔标准化的微量元素图显示岩浆岩具有轻稀土元素相对重稀土元素的富集，以及明显的大离子亲石元素的富集和高场强元素的亏损特征。通过对岩石学、岩相学以及地球化学数据的分析，结合区域地质资料，认为处布日岩浆岩的岩石成因为幔源岩浆和下地壳来源的熔体的不同程度混合熔体，然后经历了明显的钾长石、斜长石等矿物的分离结晶过程。处布日岩浆岩的产生与拉萨-羌塘地体碰撞后的岩石圈的拆沉有关","doi":"10.1016/j.jseaes.2019.02.022","projection":"","language":"zh","share_type":"online","east":91.6,"west":91.0,"south":32.0,"north":32.3,"scale":null,"crs":null,"filesize":0.13,"share_policy":"a","ts_created":"2021-05-28T19:50:46.589041+08:00","doi_type":"拥有自主知识产权","ts_updated":"2021-05-29T12:20:40.614579+08:00","time_description":"74百万年以来","datas_group":3,"time_description_en":"74 million years ago","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":21056,"last_login":"2022-02-09T12:02:24.544987+08:00","username":"huxiaoli","email":"huxiaoli@lzb.ac.cn","is_active":true,"is_staff":true,"user_name":"胡晓利"},"data_sources":null,"temporal_resolution":"1000 year < x","spatial_resolution":"1km - 10km","license":"Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)","fund":[21],"subtopics":{"metadata":"e5268e12-9dab-47a4-b5e4-fd790ecf0a44","three_pole":null,"third_pole":null},"username":"韩中鹏","review_time":null,"protected_duration":null,"protected_describe":null,"is_important":false,"hit_count":536}