| 孙吴-嘉荫盆地晚白垩世地层物源及构造背景 |
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| 引用本文： | 贾啸宇,高福红,修铭,刘国卿.孙吴-嘉荫盆地晚白垩世地层物源及构造背景[J].地球科学,2021,46(7):2379-2390. |
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| 作者姓名： | 贾啸宇 高福红 修铭 刘国卿 |
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| 作者单位： | 吉林大学地球科学学院,吉林长春 130061 |
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| 基金项目： | 国家自然科学基金项目41272075 |
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| 摘 要： | 为揭示孙吴-嘉荫盆地晚白垩世富饶组和太平林场组的物源特征及其构造背景，对两组样品进行了碎屑锆石LA-ICP-MS U-Pb定年和地球化学特征研究.富饶组碎屑锆石55个测点产生以下年龄峰值:65 Ma、280 Ma和496 Ma，太平林场组碎屑锆石78个测点产生以下年龄峰值:98 Ma，189 Ma，240 Ma和488 Ma，表明富饶组和太平林场组具有混合物源的特征.Al2O3/TiO2平均值分别为41.42和29.31，结合主量、微量及稀土元素特征和碎屑锆石峰值年龄，确定富饶组和太平林场组物源主要为晚中生代长英质火成岩和沉积岩.地球化学和区域构造演化特征共同揭示富饶组和太平林场组物源区构造背景为活动大陆边缘，区域内晚中生代岩浆事件、佳木斯地块北部麻山群及广泛分布的古生代花岗岩为盆地晚白垩世地层提供了沉积物源.
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| 关 键 词： | 孙吴-嘉荫盆地 富饶组 太平林场组 U-Pb年代学 地球化学 物源 构造背景 |
| 收稿时间： | 2020-08-21 |
Provenance and Tectonic Setting of the Late Cretaceous Strata in Sunwu-Jiayin Basin |
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| Jia Xiaoyu,Gao Fuhong,Xiu Ming,Liu Guoqing.Provenance and Tectonic Setting of the Late Cretaceous Strata in Sunwu-Jiayin Basin[J].Earth Science-Journal of China University of Geosciences,2021,46(7):2379-2390. |
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| Authors: | Jia Xiaoyu Gao Fuhong Xiu Ming Liu Guoqing |
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| Abstract: | To constrain the provenance characteristics and tectonic setting of the Late Cretaceous Furao and Taipinglinchang formations located in the Sunwu-Jiayin Bbasin, in this paper, the LA-ICP-MS U-Pb dating results of detrital zircons and the geochemical characteristics from the Furao and Taipinglinchang formations are studied.The 55 detrital zircons in Furao Formation yield age population of 65 Ma, 280 Ma and 496 Ma and 78 detrital zircons in Taipinglinchang Formation yield age populations of 98 Ma, 189 Ma, 240 Ma and 488 Ma, indicating that the Furao formation and Taipinglingchang Formation have the characteristics of mixture source.Al2O3/TiO2 average value of the Furao and Taipinglinchang formations is 41.42 and 29.31, combined with major、trace and REE elements and detrital zircons yield age populations, determined that the provenance of the Furao and Taipinglinchang formations is mainly derived from the Late Mesozoic felsic igneous rocks and sedimentary rocks.The geochemical and regional tectonic evolution characteristics reveal that the tectonic setting of the provenance area of the Furao and Taipinglinchang formations is the active continental margin.The Late Mesozoic magmatic events, the Mashan Group in the northern part of Jiamusi Massif and the widely distributed Paleozoic granites provide sedimentary source for the Late Cretaceous strata of the basin. |
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