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最近笔者在“专题研究”过程中,对苏州市西南郊新郭镇 PX2孔争议地层进行了详细的工作,通过系统地采集样品,进行孢粉、密度、微量元素及铷锶年龄等测试。笔者认为该孔深部地层既不是中下泥盆统茅山群,也不能归属二叠系堰桥组,而应与浙北安吉孝丰的中上志留统康山群(S_(2-3) kn)相类比。PX2孔岩性可分为上、下两段。上段:灰、深灰色薄一中厚层状粉砂岩、细砂岩互层,夹泥岩或粉砂质泥岩,泥质或硅质胶结,不含钙,水平微层理发育,偶见腕足类化石碎片,伪厚309.84米。下段:为深灰色厚一巨厚层状泥质粉砂岩和泥岩,上部含细砂质条带,局部显水平页理。伪厚112米。岩性自下而上显示了由细变粗的反序列沉积特征,色泽深,岩
Recently, in the process of “special study”, the author carried out detailed work on the PX2 pore disputed formation in Xin Guo town, southwestern suburbs, Suzhou. The samples were systematically collected and tested for sporopollen, density, trace elements and rubidium-strontium age. The author believes that the deep strata of the hole are neither the Lower Middle Devonian Maoshan Group nor the Permian Weirqiao Formation, but should be connected with the Middle Upper Siluriferous Kangshan Group (S_ (2-3) kn) in Xiaofeng, Anji, Similar ratio. PX2 hole lithology can be divided into upper and lower two sections. Upper section: gray, dark gray, medium-thick layer of siltstone, interbedded fine sandstone, mudstone or silty mudstone, clay or siliceous cementation, calcium-free, horizontal microtitration development, occasionally brachiopods Fragments, pseudo-thick 309.84 meters. The lower section: dark gray thick a thick layer of argillaceous siltstone and mudstone, the upper with fine sandy belts, local significant level page management. Pseudo thick 112 meters. From the bottom up, lithology shows the sedimentary features of thinning coarse anti-sequence, deep color, rock