浙江东部沿海早白垩世海侵地层确定及其意义  

The establishment of marine Early Cretaceous strata in east area of Zhejiang coast and its significance

作　　者：徐立明 金春爽[2] 姜在兴[3] 邓克 江东辉[4] 

机构地区：[1]福建省地质调查研究院,福州350013 [2]国土资源部油气资源战略研究中心,北京100034 [3]中国地质大学(北京),北京100083 [4]中国石化股份公司上海海洋油气分公司,上海200120

出　　处：《福建地质》2016年第2期92-103,共12页Geology of Fujian

基　　金：全国油气资源战略选区调查与评价国家专项(第二批):东海陆架盆地南部油气资源战备调查与选区项目(2009GYXQ05)

摘　　要：浙江象山“石浦灰岩”的形成时代一直存在争议。对“石浦灰岩”下部砂砾岩进行锆石年龄测定为120～112Ma，这为“石浦灰岩”下限年龄。结合前人研究成果，“石浦灰岩”中侵人岩脉的时代为100Ma左右。因此，可确定“石浦灰岩”沉积时代为112～100Ma，即为早白垩世阿普特阶（Aptian）-阿尔必阶（Albian）。这与台湾地区的早白垩世云林组沉积时代相当，二者的海侵层位为同一时期海水由东往西侵入形成。该套地层时代的确定对研究浙江东部及东海陆架盆地南部地区早白垩世沉积相、重塑古地理环境具有重要意义，也为东海陆架盆地南部中生界油气地质条件评价提供有利依据。The formative age of＂ Shipu limestone has been controversy all along, which is at Shipu town, Xiangshan county, Ningbo city, Zhejiang province. This paper study elastic zircon dating of the glutenite which is in the lower of ＂Shipu limestone＂, as a result the elastic zircon age is mainly 120- 112Ma, which is the lower limit age of ＂Shipu limestone＂ Combining with the investigation fruit of predecessor, this result show that the age of intrusive dike is about 100Ma in the ＂ Shipu limestone＂ . Thus, the sedimentary age of ＂Shipu limestone＂ is 112- 100Ma, which is Aptian-Albian of Early Cretaceous. This is similarly with Yunlin group in Taiwan, and their invasion horizon formed in the same period of seawater intrusion from east to west. It is of far reaching importance base on the strata age to study the sedimentary context and remold ancient geographic environment of eastern Zhejiang and southern East China Sea shelf basin in the Early Cretaceous. And it also supply advantaged gist to appraise the oilgas geologic condition of Mesozoic of Southern East China Sea shelf basin.

关 键 词：“石浦灰岩” 锆石定年 早白垩世 东海陆架盆地 浙江东部沿海 

分 类 号：P534.53[天文地球—古生物学与地层学]