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首页> 外文期刊>Chinese science bulletin >Unusual high-density and saline aqueous inclusions in ultrahigh pressure metamor-phic rocks from Sulu terrane in eastern China
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Unusual high-density and saline aqueous inclusions in ultrahigh pressure metamor-phic rocks from Sulu terrane in eastern China

机译：中国东部苏鲁山地带超高压变质岩中异常高密度盐分包裹体

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摘要

Primary high-density fluid inclusions were identified in garnet from ultrahigh pressure eclogite in the southern part of the Sulu terrane. They occur isolatedly or in cluster together with relatively low-density two-phase inclusions. The eutectic temperature of the inclusions is as low as ≤ -52℃. A bubble was nucleated in a liquid inclusion during the specific stage of cyclic cooling-heating runs, and the liquid-gas homogenization temperature was measured to be ≤-12.5℃. The composition of the inclusions modeled by the system CaCl_2-NaCl-H_2O, yields the fluid density of 1.27 g/cm~3 that corresponds to a pressure of ca. 2.4 GPa at the temperature of peak eclogite-facies metamorphism, close to the ultrahigh pressure metamorphic conditions. During the exhumation of the eclogite the inclusions reacted with the host mineral, forming hydrous silicate minerals that resulted in lowering of the fluid density and its transformation to multi-phase inclusions.
机译：在苏鲁地层南部的超高压榴辉岩中，石榴石中发现了主要的高密度流体包裹体。它们与相对低密度的两相夹杂物一起孤立或成簇出现。夹杂物的共晶温度低至≤-52℃。在循环冷却-加热运行的特定阶段，气泡在液体夹杂物中成核，并且测得的液气均质温度≤-12.5℃。用CaCl_2-NaCl-H_2O系统模拟的夹杂物组成，得出的流体密度为1.27 g / cm〜3，对应于大约1 MPa的压力。在峰辉岩相变质温度下，接近2.4 GPa，接近超高压变质条件。在榴辉岩的发掘过程中，夹杂物与主体矿物发生反应，形成含水的硅酸盐矿物，导致流体密度降低，并转变为多相夹杂物。

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