西秦岭伯阳镇中泥盆统碎屑岩的岩石学、碎屑锆石U-Pb年龄及其地质意义
Geological Significance of Detrital Zircon U-Pb Age of Middle Devonian Proximal Sedimentary Rocks in Boyang Town, Western Qinling Orogenic Belt
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摘要: 西秦岭伯阳地区中泥盆统砾岩及其砂岩夹层的岩石学特征显示，其成分成熟度和结构成熟度都很低，具有近源沉积岩的特点，砾岩中还含有少量的糜棱岩砾石。砂岩夹层的碎屑锆石具有岩浆锆石的特征，采用LA-ICP-MS锆石U-Pb同位素定年方法，测得碎屑锆石的U-Pb年龄谱明显分为4组：①440~480Ma，约占3%；②540~600Ma，约占4%；③880~1 020Ma，约占79%；④1 040~1 080Ma，约占13%。880~1 020Ma的年龄呈现最强烈的峰值，该年龄峰值与西秦岭地区新元古代晋宁期岩浆作用的时代一致，也与北秦岭地区Rodinia超大陆的汇聚事件一致。结合区域地质资料综合分析，认为研究区在中泥盆世时发生过显著的构造隆升与剥蚀事件。此外，伯阳中泥盆统碎屑沉积物质主要来源于西秦岭和北祁连，说明中泥盆世时研究区与西秦岭造山带之间可能已不存在沉积阻隔区，二者可能已经对接。
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关键词:
- 西秦岭-祁连结合区 /
- 中泥盆统 /
- 碎屑锆石 /
- LA-ICP-MS年代学
Abstract: The petrological study of Middle Devonian sandstones and conglomerates in Boyang area, Western Qinlingorogenic belt indicates that their composition maturity and structure maturity are very low, with the characteristics of the proximal deposit. In addition, the conglomerate has a few of the mylonitic gravels. The clastic zircons of sandstone interbeds from the Middle Devonian conglomerate in Boyang area are characterized by magmatic zircons. By clastic zircon LA-ICP-MS U-Pb dating of the sandstone interbeds, the age spectra of clastic zircon can be divided into 4 groups:①440~480 Ma, accounting for about 3%; ②540~600 Ma, accounting for about 4%; ③880~1 020 Ma, accounting for about 79%; ④1 040~1 080 Ma, accounting for about 13%. The age of 880~1 020 Ma shows the strongest peak, which is in accordance with the age of the Jinning period of Neo-proterozoicmagmatism in the Western Qinlingorogenic belt, and also is in accordance with age of the Rodinia supercontinent aggregation event. Integrating with the regional geological material, it is proposed that a significant tectonic uplift-erosion existed in the studied area during Middle Devonian. The clastic sediments of Middle Devonian strata mainly came from both of the Western Qinling and the Northern Qilian orogenic belt, so it is deduced that no longer exists deposition barrier zone in the area between the studied area and the Western Qinlingorogenic belt during Middle Devonian, and both of the Qinling and Qilian orogenic belts were possibly really amalgamated. -
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