Discussion on Texture Types and Geologic Origin of Stone Screen from Qingjiang,Hubei Province
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摘要: 清江画面石是近二十年来出现的一种新的观赏石石种，原石主要为中泥盆统云台观组灰白色石英砂岩。清江画面石具有观赏价值的关键因素是构成画面的各类图案。本文将画面石图案的纹理类型划分为三种类型——线型、条带型和梳型，并对每种类型进行了详细描述。在野外调查基础上，通过岩石特征、微观结构构造、地球化学特征等综合对比分析，对三种类型的清江画面石图案的地质成因进行初步讨论，认为线型（即裂隙）的形成可能与燕山期或之后区域构造活动有关，条带型（即层理）形成于泥盆纪的原生沉积构造，而梳型则可能是由于外来物质在成岩期后沿着层理面或纹层面向下渗流而成，推测形成于燕山期之前，但需进一步研究确定。三种图案中的不同颜色，是由含有铁锰质氧化物的地下水或地表径流水等沿裂隙、层理面或渗流面浸染或部分交代填隙物而成，在现代河流下切作用下，崩落入水，经过流水搬运、冲刷，最终形成了清江画面石。Abstract: Stone screen from Qingjiang has been a new kind of view stones in recent 20years，which originates from grey quartz sandstone of Middle Devonian Yuntaiguan Formation.The textures on the surface of the stone screen from Qingjiang are the key factor of its ornamental value，and there are three kinds，including linear texture（fractures），banded texture（beddings）and comb texture（the infiltrating texture with convex top surface）.Through the field work and synthesizing petrology features，microscopic texture and geochemistry features，the article focuses on the geologic origins of the textures.Fractures are taken shape from the faults formed during or after Yanshan movement.Beddings originated at the same time of Yuntaiguan Formation sedimentation.Comb texture is probably caused by vadose foreign matter along the bedding surface during the late diagenesis，before Yanshan movement，though it needs further proof.The fuchsia or grayish－green bands of the three kinds of textures are caused by irony or manganic matter carrying by surface and ground water precip－itating in porosity.During neotectonics period，the original rock was put to the river and became stone screen from Qingjiang by washing and erosion.
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Keywords:
- stone screen /
- view stone /
- texture type /
- geologic origin /
- Qingjiang,Hubei Province
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