Provenance Analysis of Middle Yanchang Formation in the Southeastern Ordos Basin and Its Indications for the Uplift of the Qinling Orogenic Belt
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摘要:
为了厘清盆地东南部延长组中期沉积物源，从而限定秦岭造山带隆升启动时限，利用碎屑锆石U-Pb测年方法，对鄂尔多斯盆地东南部金锁关、下寺湾、黄陵和黄龙地区延长组中期物源进行分析。结果表明：金锁关地区碎屑锆石年龄组合主要分布为
2200 ～2700 Ma、1700 ～2100 Ma、900～1200 Ma、400～500 Ma、205～382 Ma；黄龙、下寺湾、黄陵地区碎屑锆石年龄组合主要分布为2200 ～2700 Ma、1700 ～2100 Ma、205～382 Ma。综合研究认为：①存在一个湖盆沉积中心，将延长组中期盆地东南部研究区内部分割两个不同的区域，湖盆沉积中心以南的金锁关地区物源与盆地南部华北克拉通南缘和北秦岭构造带相关。湖盆沉积中心以北的黄龙、黄陵和下寺湾地区物源主要与盆地北部阴山地块、孔兹岩带以及华北克拉通北缘华力西期—印支期热事件岩浆岩岩体相关。②长7期金锁关沉积物与秦岭造山带有良好的沉积响应，其中最年轻锆石颗粒反映造山带在（234.7±4） Ma左右开始隆升造山。-
关键词:
- 碎屑锆石U-Pb定年 /
- 沉积物源 /
- 秦岭造山带 /
- 鄂尔多斯盆地 /
- 延长组
Abstract:In order to clarify the provenance of the southeastern part of the Ordos Basin and distinct the initiation time of the Qinling orogenic belt uplift during the middle Yanchang Formation, detrital zircon U-Pb dating method was used to analyze the provenance of the Jinsuoguan, Xiashiwan, Huangling and Huanglong areas, which is part of the Ordos Basin. The age assemblages of detrital zircons in Jinsuoguan area are
2200 ～2700 Ma,1700 ～2100 Ma, 900～1200 Ma, 400～500 Ma and 205～382 Ma. The detrital zircon age assemblages in Huanglong, Xiasiwan and Huangling are2200 ～2700 Ma,1700 ～2100 Ma and 205～382 Ma. Comprehensive study found: ① The lacustrine depositional center divides two different areas inside the southeastern study area of the middle Yanchang Formation basin, south of lake basin center of jinsuoguan main stem from the south of the southern margin of the north China craton basin and north Qinling tectonic belt. The provenance of the huanglong, Huangling and Xiashiwan areas which are located at the north of lake center is mainly derived from the Yinshan block、the Konzi rock belt and hercynian indosinian thermal event magmatic rocks in the north Margin of the North China Craton. ② The sediments have a good sedimentary response to the Qinling orogenic belt in Jinsuoguan during in chang 7, the youngest zircon grains reflect that the orogenic belt began to uplift around (234.7±4) Ma. -
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表 1 研究区峰值年龄百分比统计
Table 1. Percentage statistics of peak age in the study area
地区 样品号 层位 所测锆石数（颗） 谐和锆石数（颗） 各年龄段（Ma ）碎屑锆石数（颗）及百分比 2200 ～2700 1700 ～2100 900～ 1200 400～500 205～382 金锁关 DN-19 长7 99 79 16（20%） 34（43%） 6（8%） 6（8%） 7（9%） 金锁关 DN-11 长6 132 94 17（18%） 43（46%） 7（7%） 11（12%） 7（7%） 下寺湾 新58-1 长6 102 93 42（45%） 18（19%） 1 1 29（31%） 下寺湾 新58-2 长6 102 90 35（39%） 14（16%） 0 0 38（42%） 下寺湾 上150 长6 102 97 25（26%） 48（49%） 0 1 19（20%） 下寺湾 万138 长6 102 86 31（36%） 13（15%） 1 1 35（40%） 黄龙 DN-37 长6 132 94 45（48%） 13（14%） 0 1 29（31%） 黄龙 DN-34 长4+5 120 86 23（27%） 11（13%） 1 0 39（46%） 黄陵 DN-29 长4+5 114 93 35（38%） 38（41%） 0 1 14（15%） 
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表 2 鄂尔多斯盆地延长组长7底部凝灰岩锆石U-Pb年龄统计表
Table 2. U-Pb zircon ages of the tuff from the bottom of Chang 7 of Yanchang Formation in Ordos basin
下载: 导出CSV
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