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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Seismic properties of lawsonite eclogites from the southern Motagua fault zone, Guatemala
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Seismic properties of lawsonite eclogites from the southern Motagua fault zone, Guatemala

机译：危地马拉南部Motagua断裂带的钠钙榴石榴辉岩的地震特性

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摘要

We present new data on the crystal preferred orientation (CPO) and seismic properties of omphacite and lawsonite in extremely fresh eclogite from the southern Motagua fault zone, Guatemala, to discuss the seismic anisotropy of subducting oceanic crust. The CPO of omphacite is characterized by (010)[001], and it shows P-wave seismic anisotropies (AV(P)) of 1.4%-3.2% and S-wave seismic anisotropies (AV(S)) of 1.4%-2.7%. Lawsonite exhibits (001) planes parallel to the foliation and [010] axes parallel to the lineation, and seismic anisotropies of 1.7%-6.6%AV(P) and 3.4%-14.7% AV(S). The seismic anisotropy of a rock mass consisting solely of omphacite and lawsonite is 1.2%-4.1%AV(P) and 1.8%-6.8%AV(S). For events that propagate more or less parallel to the maximum extension direction, X, the fast S-wave velocity (Vs) polarization is parallel to the Z in the Y-Z section (rotated from the X-Z section), causing trench-normal seismic anisotropy for orthogonal subduction. Based on the high modal abundance and strong fabric of lawsonite, the AV(S) of eclogites is estimated as similar to 11.7% in the case that lawsonite makes up similar to 75% of the rock mass. On this basis, we suggest that lawsonite in both blueschist and eclogite may play important roles in the formation of complex pattern of seismic anisotropy observed in NE Japan: weak trench-parallel anisotropy in the forearc basin domains and trench-normal anisotropy in the backarc region. (C) 2016 Elsevier B.V. All rights reserved.
机译：我们提供了有关危地马拉南部Motagua断层带中极其新鲜的榴辉岩中辉绿岩和钙钠榴石的晶体优选取向（CPO）和地震特性的新数据，以讨论俯冲洋壳的地震各向异性。绿沸石的CPO的特征是（010）[001]，它的P波地震各向异性（AV（P））为1.4％-3.2％，S波地震各向异性（AV（S））为1.4％- 2.7％。钙钠榴石呈现出平行于叶面的（001）平面和平行于衬线的[010]轴，地震各向异性为1.7％-6.6％AV（P）和3.4％-14.7％AV（S）。仅由绿泥石和钙钠石组成的岩体的地震各向异性为1.2％-4.1％AV（P）和1.8％-6.8％AV（S）。对于或多或少平行于最大延伸方向X传播的事件，快速S波速（Vs）极化与YZ剖面中的Z平行（从XZ剖面旋转），从而导致正交俯冲。基于钙钛矿的高模态丰度和结实的结构，如果钙钠锰矿占岩体的75％左右，则榴辉岩的AV（S）估计接近11.7％。在此基础上，我们建议，蓝晶岩和榴辉岩中的钙钠榴石可能在日本东北部观测到的地震各向异性的复杂模式的形成中起重要作用：前弧盆地域的弱沟槽平行各向异性和后弧区域的沟槽法向各向异性。 （C）2016 Elsevier B.V.保留所有权利。

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