| 蔡厚安,徐德斌,高海欧,侯朝勇.辽西阜新盆地及外围早白垩世火山岩锆石SHRIMP U-Pb定年及其对喷发期次的限定[J].矿产勘查,2021,12(2):200-207 |
| 辽西阜新盆地及外围早白垩世火山岩锆石SHRIMP U-Pb定年及其对喷发期次的限定 |
| Ziron SHRIMP U-Pb dating of Early Cretaceous volcanic rocks in Fuxin Basin and periphery, western Liaoning Province:Constraint on the eruption times |
| 投稿时间：2020-05-22 |
| DOI： |
| 中文关键词: 锆石SHRIMP U-Pb同位素年龄 中生代火山岩 彰武-黑山地区 阜新盆地 辽西 |
| 英文关键词: ziron SHRIMP U-Pb age, Mesozoic volcanic rocks, Zhangwu-Heishan area, Fuxin Basin, western Liaoning Province |
| 基金项目:中国地质调查局项目(编号:DD20160001)资助。 |
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| 中文摘要: |
| 火山岩时代和层位是资源勘探和沉积构造演化的基础性问题之一。阜新盆地构造位置属华北地块的东北端燕山褶皱带东部,早白垩世火山岩发育。该文通过在辽西阜新盆地及外围黑山-彰武地区系统采集了1套火山岩样品,测试锆石SHRIMP U-Pb同位素年龄。结合前人成果,提出区内白垩世的火山活动划分为5期,活动时间分别为(100±5)Ma、(115±2)Ma、(122±2)Ma、(126±1)Ma和(132±1)Ma。结合野外工作认为阜新盆地及周边的彰武-黑山地区早白垩世火山岩主要包括3套火山岩和一套古近纪含橄榄石包体的玄武岩。第1套为裂隙式喷发的中基性的玄武安山岩,见于十家子、罗台山、张罗屯等地；第2套为中性粗安岩系,见于哈拉和稍尖山子,黄花山,苍土乡下石土村等地；第3套属裂隙式喷发的中基性玄武安山岩,见于尖山子、豆芽窝铺和苍土乡下石土村等地。古近纪碱性玄武岩年龄为(56±2.9)Ma,分布在阜新县十家子镇那立闪村等地。 |
| 英文摘要: |
| The age and horizon of volcanic rocks are the basic problems of resource exploration and sedimentary structure evolution. On the basis of field investigation, a set of volcanic rock samples have been collected in and outside Fuxin Basin, and the SHRIMP U-Pb isotopic age has been measured. Based on the test result, Cretaceous volcanic activities in western Liaoning Province can be divided into 5 times, which includes (100±5)Ma, (115±2)Ma, (122±2)Ma, (126±1)Ma and (132±1)Ma. In reference to field observation, the volcanic rock in Zhangwu-Heishan area includes 3 suites of early Cretaceous volcanic rock and 1 suite of Paleogene olivine-enclave-bearing basalt. The first set of volcanic rocks is middle basic basaltic andesite with fissure eruption, which can be seen in Shijiazi, Luotaishan, Zhangluotun, etc. the second set is medium coarse andesite, which can be seen in Halaheshao Jianshanzi, Huanghuashan, Xiashitu village in Cangtu countryside, etc., the third set is middle basic basaltic andesite with fissure eruption, which can be seen in Jianshanzi, Douyawopu, Xiashitu village in Cangtu countryside, etc. The age of alkali basalt in Paleogene is (56±2.9)Ma, which is distributed in Nalishan village, Shijiazi Town, Fuxin County. |
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