| 浙江江山寒武系碎屑锆石U-Pb年龄与沉积指向构造及其古地理意义 |
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| 引用本文： | 黄仁波,刘家润,杨振宇,焦文军,李永祥.浙江江山寒武系碎屑锆石U-Pb年龄与沉积指向构造及其古地理意义[J].高校地质学报,2016,22(3):474. |
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| 作者姓名： | 黄仁波 刘家润 杨振宇 焦文军 李永祥 |
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| 摘 要： | 浙江江山北部处于紧邻江山-绍兴断裂带的扬子地块边缘；寒武系杨柳岗组陆源碎屑岩夹层中的碎屑锆石
LA-ICP-MS U-Pb定年结果表明，年龄范围为515~3340 Ma，主峰年龄828 Ma，其次为727 Ma及916 Ma；与邻区的对比结果
显示，研究区碎屑锆石年谱与华夏地块闽西北-赣中东部以及扬子地块赣东北-皖南地区可对比，尤其与前者最为相近，
而与华夏地块闽西南-赣南地区差异显著。杨柳岗组及其上覆华严寺组同沉积褶皱以及下伏大陈岭组单向斜层理特征表
明，沉积基底向北西倾斜，沉积物搬运方向由南东向北西。综合这两方面推测：在杨柳岗组沉积时期，研究区具有向北西
倾斜的沉积基底，向东南方向应与剥蚀区相连，陆源碎屑物应源自其东南方向的华夏地块东部；剥蚀区可能位于现今包括
江绍构造带在内的浙江中部，向北西方向主要提供前寒武系陈蔡群和相当于河上镇群以及少量双溪坞群或者三者剥蚀物再
沉积地层的剥蚀物质。
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| 关 键 词： | 碎屑锆石U-Pb年龄 沉积指向性构造 陆源碎屑源区 杨柳岗组 浙江江山 |
Detrital Zircon Geochronology and Directional Structures of Cambrian Sediments in Jiangshan of Zhejiang Provence and Their Palaeogeographic Significance |
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| HUANG Renbo,LIU Jiarun,YANG Zhenyu,JIAO Wenjun,LI Yongxiang.Detrital Zircon Geochronology and Directional Structures of Cambrian Sediments in Jiangshan of Zhejiang Provence and Their Palaeogeographic Significance[J].Geological Journal of China Universities,2016,22(3):474. |
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| Authors: | HUANG Renbo LIU Jiarun YANG Zhenyu JIAO Wenjun LI Yongxiang |
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| Abstract: | In this study, the age spectra of detrital zircons and sedimentary directional structures are used to investigate the
paleogeographic features, especially the paleogeography in east Cathaysian Block. The dating results of detrital zircons from clastic
interlayers of the Yangliugang Formation in northern Jiangshan of Zhejiang Province, which lies on the southeastern margin of the
Yangtze Block, show that the ages range from 515 Ma to 3340 Ma, with a major peak at 828 Ma and secondary peaks at 727 Ma and
916 Ma in the detrital age spectrum. Moreover, the result of spectrum correlation suggests that northern Jiangshan might be affinity to
northwestern Fujian and eastern central Jiangxi in the Cathaysian Block as well as northeastern Jiangxi and southern Anhui in the
Yangtze Block, however, irrelative with southwestern Fujian and southern Jiangxi in the Cathaysian Block. On the other hand, the
features of sedimentary directional structures, which include syndepositional slump folds in the Yangliugang Formation and the
overlying Huayansi Formation and cross beddings in the underlying Dachenling Formation, indicate that the sedimentary basement
inclined toward the northwest and the sediment transport direction was from the southeast to the northwest during depositional periods
of these formations. And then, it can be deduced that the provenance of zircon-bearing clastics in the Yangliugang Formation might belocated in the nowadays central part of Zhejiang Province of eastern Cathaysian Block, in which there are outcrops of metamorphic
rocks with known age corresponding to 42% detrital zircons in this study. Toward the northwest, the detrital source might have supplied
clastics eroded from older strata or redeposited materials originated from older strata. These strata mainly include the Chencai Group
and the equivalent to Heshangzhen Group and Shuangxiwu Group, which contain intrusive and volcanic rocks. |
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| Keywords: | detrital zircon U-Pb ages sedimentary directional structures detrital source Yangliugang Formation (Cambrian) Northern Jiangshan of Zhejiang Province |
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