| 川西南甘洛地区中—新生代构造沉降史分析及对铅锌保存的约束 |
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| 引用本文： | 武昱东,王宗起,罗金海,闫全人,张英利.川西南甘洛地区中—新生代构造沉降史分析及对铅锌保存的约束[J].地质学报,2015,89(8):1471-1483. |
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| 作者姓名： | 武昱东 王宗起 罗金海 闫全人 张英利 |
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| 作者单位： | 中国地质科学院矿产资源研究所,中国地质科学院矿产资源研究所,西北大学,中国科学院大学,中国地质科学院矿产资源研究所 |
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| 基金项目： | 国土资源部中国地质调查局项目 |
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| 摘 要： | 本文通过碎屑岩磷灰石、锆石裂变径迹和炭质泥岩镜质体反射率相结合的办法,重建了甘洛地区中—新生代的构造沉降史,进而探讨了构造沉降史对铅锌保存状态的约束。研究表明:晚三叠世,甘孜-理塘洋盆和西秦岭地区洋盆的闭合作用导致研究区变为前陆环境,并开始迅速接受陆相沉积,埋深迅速增加,增幅达7.6km;晚三叠世至古近纪,甘洛地区经历过多次抬升-沉降作用,总体表现为缓慢抬升,平均抬升速率不高于32.7m/Ma;新近纪,甘洛地区快速差异隆升北部抬升速率高于南部,25.5~10.3Ma期间,平均抬升速度超过295m/Ma;在6Ma至今,平均抬升速率超过667m/Ma。快速隆升过程早于川南马边地区和临沧地区,而明显晚于攀西地区,这在一定程度上支持了青藏高原东部边界晚新生代以来幕式抬升及分步向外扩展的观点。构造沉降史结果表明成矿后的深埋藏作用对原生铅锌矿具有重要的保存作用,并影响到现今矿体的就位深度。
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| 关 键 词： | 甘洛地区 裂变径迹 构造沉降史 铅锌矿 |
| 收稿时间： | 1/3/2014 12:00:00 AM |
| 修稿时间： | 2014/5/20 0:00:00 |
Characteristics of Meso-Cenozoic tectonic subsidence history and Restriction on preservation of Zn-Pb Deposit in Ganluo, Southwest Sichuan |
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| WuYudong,WangZongqi,LuoJinhai,YanQuanren and ZhangYinli.Characteristics of Meso-Cenozoic tectonic subsidence history and Restriction on preservation of Zn-Pb Deposit in Ganluo, Southwest Sichuan[J].Acta Geologica Sinica,2015,89(8):1471-1483. |
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| Authors: | WuYudong WangZongqi LuoJinhai YanQuanren and ZhangYinli |
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| Institution: | Institute of Mineral Resources,Chinese Academy of Geological Sciences,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Northwest University,University of Chinese Academy of Sciences,Institute of Mineral Resources,Chinese Academy of Geological Sciences |
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| Abstract: | The tectonic subsidence history of the Ganluo were reconstructed by using apatite fission-track, Zircon fission-track and vitrinite reflectance data of clastic rock, and correlative restriction on preservation of Zn-Pb Deposit in Ganluo was discussed. Three stages could be compartmentalized as follows: (1) During Late Triassic epoch, influenced by the subduction of the East Tethys Ocean basin, the tectonic environment of Ganluo area changed into paraforeland basin, and the buried depth stara increased rapidly, with the incremental quantity more than 7.6km. (2) Early Jurassic-Paleogene, at this stage, the tectonic regime of Ganluo area transformed and the stara uplifted discontinuously and slowly, the average uplift rate is no more than 32.7m/Ma; (3) Since the beginning of Neogene epoch, the stara of Ganluo uplift quickly, the uplift amplitude in the Northern of Ganluo is more than the Southern, the average uplift rate is more than 295m/Ma from 25.5Ma to 10.3Ma and more than 667 m/Ma from 6Ma up to now. The rapid uplift stage of Ganluo is earlyer than that of Mabian and Lincang, and significantly later than that of Western Panzhihua, this uplift feature is coincide with the outward propagation and growth deformation of tibetan plateau, which is is characterized by multistage coeval and disequilibrium developments. The results of tectonic subsidence history indicates the deep buried diagenesis after mineralization is significant for the preservation of Primary lead-zinc mine, and affects the current emplacement depth of ore body. |
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| Keywords: | Ganluo area fission track tectonic subsidence history Zn-Pb Ore |
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