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首页> 外文期刊>Contributions to Mineralogy and Petrology >Anatexis at 700 to 1000 MPa in the aureole of the Marcy anorthosite, Adirondack Highlands, New York
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Anatexis at 700 to 1000 MPa in the aureole of the Marcy anorthosite, Adirondack Highlands, New York

机译：在纽约阿迪朗达克高地Marcy钙铁矿的光环中，以700到1000 MPa的压力分析

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摘要

High temperature (>900 deg C) metamorphism affected the New Russia gneiss complex in the aureole of the Marcy anorthosite, Adirondack Highlands, New York. Dehydration melting of pargasitic hornblende and plagioclase in metagabbro during contact metamorphism produced garnet among other phases, an indicator that pressure exceeded 700 MPa during anatexis. Partial melting also occurred in mangerite and charnockite. Minerals that equilibrated during melting yield barometric estimates of 970 +- 100 MPa (garnet-orthopyroxene-plagioclase-quartz in metagabbro and mangerite) and 735 +- 100 and 985 +- 100 MPa (gar-net-hornblende-plagioclase-quartz, metagabbro and mangerite, respectively). From these results we infer that the Marcy anorthosite was emplaced at a depth of at least 23 km and probably near 32 km.
机译：高温（> 900摄氏度）的变质影响了纽约阿迪朗达克高地马西钙铁矿中金刚砂的新俄罗斯片麻岩复合体。在接触变质过程中，异生物中的小腹角闪石和斜长石的脱水融化会在其他相中产生石榴石，这表明在麻醉期间压力超过700 MPa。菱铁矿和长方岩中也发生了部分熔化。在熔化过程中达到平衡的矿物的气压测量值约为970±100 MPa（偏锰矿和锰铁矿中的石榴石-邻苯二茂基斜方石英-石英）和735 +-100和985 +-100 MPa（石榴石-角型角闪石斜方石英-石英，metagabbro）和菱镁矿）。从这些结果中我们可以推断出，马西钙钛矿的位置至少在23 km左右，可能在32 km附近。

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