The reason of"overturned stratum"in west of Xiangshan Area
There is a appearance in west of Xiangshan area,which is stratum presented"porphyroclastic lava-rhyodacite lava-porphyroclastic lava-rhyodacite lava".This is contradiction with normal appearance.In the past,the explanation is upper rhyodacite lava or lower porphyroclastic lava is intrusive rock.In this study,we collected samples from the upper and lower layers of porphyroclastic.LA-ICP-MS zircon U-Pb isotope dating has been conducted on thses samples.Combined with the studying the textural and structural characteristic of different rhyodacite lava and porphyroclastic lava,we propose the upper and the lower rhyodacite lava both are derived from same source at same time,the upper and the lower porphyroclastic lava also both are derived from same source at same time.The appearance of"porphyroclastic lava-rhyodacite lava-porphyroclastic lava-rhyodacite lava"is presented liner maybe related to a major disruption.This disruption is located in deep schist.
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