大别山南部高压-超高压变质地体中云母片岩和片麻岩的相平衡研究
Phase equilibria of mica-schists and gneisses in the HP-UHP Belt of Southern Dabie Shan
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摘要: 对于大别山高压一超高压变质带中大面积出露的云母片岩和片麻岩的变质条件和演化历史有不同的认识：如中低压绿帘角闪岩相，高压角闪岩相和超高压榴辉岩相。通过对大别山南部超高压榴辉岩区、高压榴辉岩区和宿松变质杂岩带中的云母片岩和片麻岩进行详细的岩相学及相平衡研究表明：它们的变质条件分别为610℃～690℃，1．2～1．4GPa；590～600℃、1．3～1．5GPa；520～590℃，0．9～1．4GPa，相当于高压绿帘角闪岩相、高压角闪岩相与榴辉岩相之间的过渡。依据超高压榴辉岩区绿帘石黑云片麻岩中的石榴石环带特征推测，它们很可能经过超高压变质阶段。现有矿物组合记录了抬升阶段的条件。但是高压榴辉岩区的石榴石绿帘石二云片麻岩和宿松变质杂岩带中石榴石云母片岩中的石榴石环带特征表明，其现有矿物组合记录了变质峰期条件，不应该经历更高压变质阶段。在KFMASH体系的PT视剖面图上计算多硅白云母Si含量等值线表明，在多数矿物组合中白云母的Si含量可作为地质压力计，但Si等值线的斜率受到矿物组合的控制。
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关键词:
- 云母片岩和片麻岩 /
- 相平衡 /
- PTt轨迹 /
- 多硅白云母地质压力计 /
- 大别山
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Key words:
- Mica-schists and gneisses /
- phase equilibrium /
- PTt path /
- phengite geobarometer /
- Dabieshan
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