西昆仑库孜一带长城纪火山岩地球化学特征及地质意义
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摘要
西昆仑库孜一带长城纪赛图拉岩群为一套火山熔岩-火山碎屑岩-沉积岩组合,火山岩主体为中酸性岩。通过对该地区长城纪火山岩分布特征、岩石学特征及地球化学特征进行分析研究,划分了2个火山喷发旋回。2个喷发旋回岩性无明显区别,均为一套中酸性火山熔岩、火山碎屑岩、沉积岩建造。第一喷发旋回自下而上见7个喷发韵律,爆发指数为41.70%,喷溢指数24.51%,该旋回岩相总体表现为爆发—喷溢—沉积—爆发—沉积—爆发的特点;第二喷发旋回自下而上见4个喷发韵律,爆发指数为46.67%,喷溢指数为18.15%,该旋回岩相总体表现为爆发—沉积—爆发—沉积—爆发的特点,揭示了西昆仑库孜一带古塔里木陆块裂解古洋盆的演化特征,对研究该地区古陆块裂解具有一定的借鉴意义。
Statherian Saitula group in Kuzi area in western Kunlun is a set of volcanic lava-pyroclastic rock-sedimentary rock assemblage, and the volcanic rocks are mainly intermediate-acid rocks. Based on the analysis of the distribution, petrological and geochemical characteristics of Statherian volcanic rocks in this area, two volcanic eruption cycles are divided. There is no obvious difference in lithology between the two eruption cycles, all of which are a set of medium-acid volcanic lava, pyroclastic rocks and sedimentary rocks. Seven eruption rhythms from bottom to top can be found in the first eruption cycle. The burst index is 41.70 %, and the eruption index is 24.51 %. The cyclic lithofacies shows the characteristics of burst-eruption-deposition-eruption-deposition-eruption. There are four eruption rhythms from bottom to top in the second eruption cycle. The eruption index is 46.67 %, and the eruption index is 18.15 %. The lithofacies of the cycle shows the characteristics of eruption-deposition-eruption-deposition-eruption. It is revealed that the evolution characteristics of the ancient ocean basin has been cracked by the Guttari continental block in Kuzi area in western Kunlun mountains. It has certain guiding significance for the study of the ancient ocean basin cracked by the continental block in this area.
Statherian Saitula group in Kuzi area in western Kunlun is a set of volcanic lava-pyroclastic rock-sedimentary rock assemblage, and the volcanic rocks are mainly intermediate-acid rocks. Based on the analysis of the distribution, petrological and geochemical characteristics of Statherian volcanic rocks in this area, two volcanic eruption cycles are divided. There is no obvious difference in lithology between the two eruption cycles, all of which are a set of medium-acid volcanic lava, pyroclastic rocks and sedimentary rocks. Seven eruption rhythms from bottom to top can be found in the first eruption cycle. The burst index is 41.70 %, and the eruption index is 24.51 %. The cyclic lithofacies shows the characteristics of burst-eruption-deposition-eruption-deposition-eruption. There are four eruption rhythms from bottom to top in the second eruption cycle. The eruption index is 46.67 %, and the eruption index is 18.15 %. The lithofacies of the cycle shows the characteristics of eruption-deposition-eruption-deposition-eruption. It is revealed that the evolution characteristics of the ancient ocean basin has been cracked by the Guttari continental block in Kuzi area in western Kunlun mountains. It has certain guiding significance for the study of the ancient ocean basin cracked by the continental block in this area.
引文
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[14] 傅树超,卢清地.陆相火山岩区填图方法研究新进展[J].地质通报,2010,29(11):1640-1648.
[15] Le Maitre R W (ed).A Classification of Igneous Rocks and Glossary of Terms[M].Oxford:Blackwell Sel.Pub,1989:1-193.
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[17] Boynton W V.Cosrnochemistry of the rare earth elements[J].Meteorite studies Dev,Geochem,1984(2):63-114.
[18] Pearce J A and Cann J R.Tectonic setting of basic volcanic rocks determined using trace element analysis[J].Earth and Planetary Science Letters,1973(12):290-300.
[19] 赵振华.关于岩石微量元素构造环境判别图解使用的有关问题[J].大地构造与成矿学,2007,31(1):93-102.
[20] 邓晋福,刘翠,冯艳芳,等.关于火成岩常用图解的正确使用:讨论与建议[J].地质论评,2015,61(4):717-732.
①山东省第四地质矿产勘查院,新疆西昆仑1∶5万J43E014017,J43E015017,J43E016017,J43E017017四幅区域地质调查,2014年。
②王世炎等,1∶25万克克吐鲁克幅(J43C003002)、塔什库尔干塔吉克自治县幅(J43C003003)区域地质调查报告,河南省地质调查院,2004年。
[2] 中国科学院青藏高原综合科学考察队(潘裕生主编).喀喇昆仑山-昆仑山地区地质演化[M].北京:科学出版社,2000:22-147.
[3] 丁道贵,王道轩,刘伟新,等.西昆仑造山带与盆地[M].北京:地质出版社,1996:72-105.
[4] 肖序常,王军.青藏高原构造演化及隆升的简要评述[J].地质论评,1998,44(4):372-381.
[5] 任纪舜,王作勋,陈炳蔚,等.从全球看中国大地构造(中国及邻区大地构造图)[M].北京:地质出版社,1999:1-15.
[6] 郭坤一,张传林,沈家林,等.西昆仑中元古代长城系火山岩地球化学[J].地质通报,2004,23(2):130-135.
[7] 郭坤一,张传林,赵宇,等.西昆仑东段北缘中元古代岛弧火山岩地球化学特征[J].中国地质,2000,29(2):161-165.
[8] 张传林,赵宇,郭坤一,等.塔里木西南蓟县系双峰式火山岩中基性岩地球化学特征[J].地球科学,2003,28(1):47-53.
[9] Zhang Chuanlin,Dong Yongguan,Zhao Yu,et al.Geochemistry of Meso-Proterozioc volcanites in Western Kunlun:evidence for the plate tectonic evolution[J].Acta Geoogica Sinica,2003,77(2):237-245.
[10] 董连慧,李卫东,张良臣,等.新疆大地构造单元划分及其特征[A]//第六届新疆天山地质矿产资源学术会议讨论会论文集[C].乌鲁木齐:中国青少年出版社,2008:27-32.
[11] 新疆维吾尔自治区地质矿产局.新疆维吾尔自治区岩石地层[M].北京:中国地质大学出版社,1999:143-317.
[12] 毕华,王中刚.西昆仑造山带构造演化与岩浆活动[M].长沙:中南工业大学出版社,2000:1-25.
[13] 邱家骧.火山岩相及其主要特征[J].地质科技情报,1984(2):49-56.
[14] 傅树超,卢清地.陆相火山岩区填图方法研究新进展[J].地质通报,2010,29(11):1640-1648.
[15] Le Maitre R W (ed).A Classification of Igneous Rocks and Glossary of Terms[M].Oxford:Blackwell Sel.Pub,1989:1-193.
[16] S.J.G.Galer,S.L.Goldstein,R.K.O'Nions.Limits on chemical and convective isolation in the Earth's interior[J].Chem.Geol,1989(75):257-290.
[17] Boynton W V.Cosrnochemistry of the rare earth elements[J].Meteorite studies Dev,Geochem,1984(2):63-114.
[18] Pearce J A and Cann J R.Tectonic setting of basic volcanic rocks determined using trace element analysis[J].Earth and Planetary Science Letters,1973(12):290-300.
[19] 赵振华.关于岩石微量元素构造环境判别图解使用的有关问题[J].大地构造与成矿学,2007,31(1):93-102.
[20] 邓晋福,刘翠,冯艳芳,等.关于火成岩常用图解的正确使用:讨论与建议[J].地质论评,2015,61(4):717-732.
①山东省第四地质矿产勘查院,新疆西昆仑1∶5万J43E014017,J43E015017,J43E016017,J43E017017四幅区域地质调查,2014年。
②王世炎等,1∶25万克克吐鲁克幅(J43C003002)、塔什库尔干塔吉克自治县幅(J43C003003)区域地质调查报告,河南省地质调查院,2004年。