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首页> 外文期刊>Journal of geodynamics >Tectonic assembly of the Brevard-Chauga belt, South Carolina: Fluid inclusion evidence from Appalachian Deep Core Site Investigation Hole 2 (ADCOH-2)
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Tectonic assembly of the Brevard-Chauga belt, South Carolina: Fluid inclusion evidence from Appalachian Deep Core Site Investigation Hole 2 (ADCOH-2)

机译：南卡罗来纳州布雷瓦尔德-乔uga带的构造集结：来自阿巴拉契亚深部核心现场调查孔2（ADCOH-2）的流体包裹体证据

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摘要

Appalachian Deep Core Hole 2 (ADCOH-2) penetrated part of one of the most persistent and important tectonostratigraphic belts in the southern Appalachians―the Brevard-Chauga belt in South Carolina. The Brevard-Chauga belt is a subdivision of the Inner Piedmont and it includes the Brevard fault zone. The 307 m core contains four imbricated slices of Early Ordovician Henderson Gneiss and metasedimentary rocks of the Chauga River Formation. Aqueous (NaCl-CaCl_2) inclusions and CO_2-CH_4-rich inclusions present in syntectonic quartz veins in the metasedimentary units, together with garnet-biotite geothermometry, provide information on the P-T conditions during uplift. Garnet-biotite geothermometry in the Brevard metasiltstone indicates a crystallization temperature of 466+-52℃, which together with published ~(40)Ar/~(39)Ar hornblende data from the Chauga belt, are interpreted as a Neoacadian (late Devonian) garnet crystallization age. High-density CO_2-rich fluid inclusion isochores indicate a pressure of ～4.5 kbar at 466+-52℃ at this time. A Rb-Sr muscovite model age of 302 Ma in retrograde mylonitic Henderson Gneiss is interpreted as an Alleghanian recrystallization age. Fluid inclusions record a 2.5 kbar decompression event at this time, consistent with thrust assembly of the tectonostratigraphic units in the core.
机译：阿巴拉契亚深孔2（ADCOH-2）穿透了南部阿巴拉契亚最持久，最重要的构造地层带之一—南卡罗来纳州的Brevard-Chauga带。 Brevard-Chauga带是内山麓的一个细分，其中包括Brevard断层带。 307 m的岩心包含早奥陶纪亨德森片麻岩的4个片状薄片和Chauga河组的准沉积岩。存在于变质沉积单元的同构造石英脉中的含水（NaCl-CaCl_2）夹杂物和富含CO_2-CH_4的夹杂物，加上石榴石-黑云母地热仪，为隆升过程中的P-T条件提供了信息。 Brevard变质沉积岩中的石榴石-黑云母地热测定表明，其结晶温度为466 + -52℃，再加上Chauga地带的已公布的〜（40）Ar /〜（39）Ar角闪石数据，被解释为新统（泥盆纪晚期）石榴石的结晶年龄。高密度富含CO_2的流体包裹体等渗线表示此时466 + -52℃的压力为〜4.5 kbar。逆行性Mylonitic亨德森片麻岩的Rb-Sr白云母模型年龄为302 Ma，被解释为Alleghanian重结晶年龄。流体包裹体此时记录了一个2.5 kbar的减压事件，这与岩心中地层构造单元的推力组装相一致。

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