阿尔金索尔库里地区泥盆纪岩墙侵位时代及构造意义
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摘要
阿尔金索尔库里地区泥盆纪岩墙依据岩性主要可分为辉绿岩墙及花岗闪长岩墙,单体呈板状,与围岩接触面平直,主要走向为NEE-SWW向及近E-W向,倾角较大。对辉绿岩岩墙的锆石LA-ICP-MS测年结果为(381. 2±2. 9) Ma,指示岩墙形成于晚泥盆世。基于岩墙产状及分布特征,利用Win-Tensor软件进行了古构造应力反演,结果表明岩墙形成于先存剪节理,受走滑应力场控制。同时,结合区域构造演化历程,提出在晚泥盆世之前阿尔金断裂存在一期走滑活动。
The dykes in Suoerkuli Area can be divided into diabase and granodiorite according to their lithology. The individual dyke is tabular,the contact surface between dyke and surrounding rock is straight,the strikes are mainly NEE-SWW and near E-W,which have steep dip angles. The result of zircon LA-ICP-MS dating of diabase is( 381. 2 ± 2. 9) Ma,which denotes that the dykes formed in Late Devonian. Based on the attitude and distribution characteristics of dykes,the inversion of paleostress field is conducted by the using of software Win-Tensor. The results demonstrate that dykes were generated from pre-existing joints and controlled by slide-slip stress field. Consequently,we propose that a slide-slip movement existed before Late Devonian with combination of regional tectonic development.
The dykes in Suoerkuli Area can be divided into diabase and granodiorite according to their lithology. The individual dyke is tabular,the contact surface between dyke and surrounding rock is straight,the strikes are mainly NEE-SWW and near E-W,which have steep dip angles. The result of zircon LA-ICP-MS dating of diabase is( 381. 2 ± 2. 9) Ma,which denotes that the dykes formed in Late Devonian. Based on the attitude and distribution characteristics of dykes,the inversion of paleostress field is conducted by the using of software Win-Tensor. The results demonstrate that dykes were generated from pre-existing joints and controlled by slide-slip stress field. Consequently,we propose that a slide-slip movement existed before Late Devonian with combination of regional tectonic development.
引文
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[17] Liu Y,Genser J,Ge X,et al. 40 Ar/39 Ar age evidence for Altyn fault tectonic activities in western China[J]. Chinese Science Bulletin,2003,48(18):2024-2030.
[18]郑剑东.阿尔金山大地构造及其演化[J].现代地质,1991(4):347-354.
[19]崔军文.阿尔金断裂系[M].地质出版社,1999:1-249.
[2] Rubin A M,Pollard D D. Dike-induced faulting in rift zones of Iceland and Afar[J]. Geology,1988,16(5):413-417.
[3] Delaney P T,Pollard D D,Ziony J I,et al. Field relations between dikes and joints:Emplacement processes and paleostress analysis[J]. Journal of Geophysical Research Solid Earth,1986,91(B5):4920-4938.
[4] E. M. Anderson. The Dynamics of Faulting and Dyke Formation with Applications to Britain, Oliver and Boyd,Edinburg,UK,1951.
[5] Delvaux D,Moeys R,Stapel G,et al. Palaeostress reconstructions and geodynamics of the Baikal region,Central Asia,Part I. Palaeozoic and Mesozoic pre-rift evolution[J]. Tectonophysics,1995,252(1):61-101.
[6] Eldeen U Z,Delvaux D,Jacobs P. Tectonic evolution in the Wadi Araba Segment of the Dead Sea Rift,SouthWest Jordan[J]. Stephan Mueller Special Publication,2002,2:1-19.
[7]吴才来,郜源红,雷敏,等.南阿尔金茫崖地区花岗岩类锆石SHRIMP U-Pb定年、Lu-Hf同位素特征及岩石成因[J].岩石学报,2014,30(8):2297-2323.
[8]刘良,孙勇,肖培喜,等.阿尔金发现超高压(>3. 8GPa)石榴二辉橄榄岩[J].科学通报,2002,47(9):657.
[9] Yuan H,Gao S,Liu X,et al. Accurate U‐Pb Age and Trace Element Determinations of Zircon by Laser Ablation‐Inductively Coupled Plasma‐Mass Spectrometry[J]. Geostandards&Geoanalytical Research,2010,28(3):353-370.
[10]侯贵廷.华北基性岩墙群[M].科学出版社,2012.
[11]侯贵廷,张臣,钱祥麟,等.华北克拉通中元古代基性岩墙群形成机制及构造应力场[J].地质论评,1998,44(3):309-314.
[12] Allmendinger R W,Cardozo N,Fisher D M. Structural geology algorithms. Vectors and tensors[J]. Structural Geology Algorithms Vectors&Tensors, 2012(10):1915.
[13] Delvaux D,Sperner B. Stress tensor inversion from fault kinematic indicators and focal mechanism data:the TENSOR program[M]//NIEUWLAND D. New Insights into Structural Interpretation and Modeling. Geological Society,London Special Publications. 2003,75-100.
[14] Delvaux D,Moeys R,Stapel G,et al. Paleostress reconstructions and geodynamics of the Baikal region,Central Asia, Part 2. Cenozoic rifting[J].Tectonophysics,1997,282(1–4):1-38.
[15]张治洮.阿尔金断裂的地质特征[J].西北地质科学,1985,(9):24-36.
[16] Che Zicheng,Liu Jiang,Liu Hongfu,et al. Discovery and occurrence of high-pressure,Metapelitic rocks,in Altun Mountain areas,Xinjiang Autonomous Region[J].Chinese science Bulletin,1995,40(23):1998–1991.
[17] Liu Y,Genser J,Ge X,et al. 40 Ar/39 Ar age evidence for Altyn fault tectonic activities in western China[J]. Chinese Science Bulletin,2003,48(18):2024-2030.
[18]郑剑东.阿尔金山大地构造及其演化[J].现代地质,1991(4):347-354.
[19]崔军文.阿尔金断裂系[M].地质出版社,1999:1-249.