{"id":"30848dbf-bc34-4793-8541-cc6f9962c41a","title":"伦坡拉盆地揭示晚中新世纹层状白云岩成因的岩石学数据","title_en":"Genesis of late Miocene laminar dolostones in Lunpola Basin, Qinghai Tibet Plateau","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及Excel格式存储，文件名称为LPL开头，代表LPL地区。具体样品编号、实验方法、具体数据等见文件。","description":"“白云岩”问题一直备受沉积学界的关注。但在目前实验室条件没有催化剂的条件下，仍然无法自然形成低温原生白云石，因此关于白云石形成的动力学机制一直存疑。微生物诱导作用可以有效的促进原生白云石的形成，但是关于其控制机制仍然不清楚，同时大量的微生物诱导原生白云石的例证集中在现代环境与实验室条件下，关于深时地层中的相关报道非常有限。本次研究以青藏高原中部伦坡拉盆地旺1井钻孔中获取到的晚中新世牛堡组中纹层状白云岩层为研究对象，纹层状白云岩的岩相学特征来自薄片观察，古水体特征分析来自稳定碳氧同位素分析，微观尺度的白云石形态学，矿物的空间分布特征来自扫描电镜宇透射电子显微镜观察。来自矿物学，成岩特征与同位素分析表明白云石为原生沉积，因而保留了大量原始沉积特征。白云石氧同位素值介于-3.2 to -1.76 ‰之间，碳同位素值介于-2.62 to -3.78 ‰之间，重建的古水体氧同位素平均值为-3.87‰，整体表明其形成于强蒸发环境。纹层状白云岩由富有机质层与硅酸盐碎屑层互层组成，白云石呈现纳米球粒状特征，直径约为80-100nm，空间上可见其特定的吸附于有机质薄膜与片状粘土矿物表面并可见明显的聚集与形态生长特征。这可能表明有机质薄膜与片状粘土矿物表面对低温白云石的形成具有促进作用，这与现今在实验室中观察的结果基本一致，为揭示原生白云石在深时的形成过程提供了详细的研究案例。","doi":"10.1111/sed.12744","projection":"","language":"zh","share_type":"online","east":90.2,"west":88.4,"south":31.2,"north":32.2,"scale":null,"crs":null,"filesize":19.7,"share_policy":"a","ts_created":"2021-05-29T10:33:54.771935+08:00","doi_type":"拥有自主知识产权","ts_updated":"2021-06-16T10:45:58.693266+08:00","time_description":"10百万年以来","datas_group":3,"time_description_en":"10 million years ago","data_format":null,"project":[11],"specials":["b6500306-f60b-4aa1-b0b6-0324d94866df"],"cite":null,"review_status":5,"review_invite":[{"user_name":"王浩","username":"王浩_iggcas","email":"wanghao@mail.iggcas.ac.cn","is_cancel_expert":false}],"review_editor":{"id":42421,"last_login":"2022-04-08T15:16:51.670544+08:00","username":"任慧霞","email":"510727846@qq.com","is_active":true,"is_staff":true,"user_name":"任慧霞"},"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":"30848dbf-bc34-4793-8541-cc6f9962c41a","three_pole":null,"third_pole":null},"username":"韩中鹏","review_time":null,"protected_duration":null,"protected_describe":null,"is_important":false,"hit_count":532}