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HIGH-PRESSURE, METASOMATIC ROCKS ALONG THE MOTAGUA FAULT ZONE, GUATEMALA

机译：危地马拉莫塔格亚断裂带上的高压变质岩

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The Motagua River of Guatemala follows the Motagua fault zone, the present plate boundary zone between the North American (Maya block) and Caribbean (Chortis block) plates. The central Motagua River valley is bordered by E-W-striking tectonic slices of serpentinite, some of which contain blocks of high pressure/low temperature (high P/T) eclogite, garnet amphibolite, and jadeitite. Recent exploration for commercial jadeitite (jade) has discovered considerable quantities of high P/T rocks in serpentinite bodies both further along and farther from the river. The southern bodies, south of the Motagua fault zone and adjacent to Chortis basement, also contain abundant eclogite, glaucophane eclogite, blueschist, jadeitite, and other high P/T rocks. The northern bodies, adjacent to Maya basement, include abundant jadeitite, albitite, and garnet amphibolite, but rare eclogite. Our initial studies find metasomatic signatures in most of the high-P/T rocks (e.g., phengite and quartz in veins, oscillatory zoning of jadeite and phengite, etc.). Mineralogical differences between jadeitites from the northern and southern bodies, and the different lithotectonic assemblages on the two sides of the Motagua fault zone suggest that either two high P/T events have occurred, or the two belts may be a single unit disrupted by strike slip duplexing.
机译：危地马拉的Motagua河沿Motagua断层带，该断层带是北美板块（Maya块）和加勒比板块（Chortis块）之间的当前板块边界区域。莫塔瓜河中央谷地以蛇纹岩的E-W构造带片为边界，其中一些包含高压/低温（高P / T）榴辉岩，石榴石角闪石和硬玉。最近对商用翡翠的探索已在蛇形岩体中沿河越来越远的地方发现了大量的高P / T岩石。在Motagua断层带以南且邻近Chortis地下室的南部地体，也含有丰富的榴辉岩，葡甲藻榴辉岩，蓝片岩，翡翠岩和其他高P / T岩石。与玛雅地下室相邻的北部地体包括丰富的翡翠，方铁石和石榴石角闪石，但罕见的榴辉岩。我们的初步研究发现，大多数高P / T岩石（例如脉中的硫铁矿和石英，翡翠和硫铁矿的振荡带等）都具有交代作用特征。北部和南部地区的翡翠在矿物学上的差异以及莫塔瓜断裂带两侧的不同岩性构造组合表明，要么发生了两次高P / T事件，要么两条带可能是一条被走滑破坏的单元双工。

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