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蓝闪石+硬柱石是羌塘中北部红脊山地区首次发现的呈北西—南东走向展布的硬柱蓝闪片岩带中典型的低温高压变质矿物组合。蓝闪石呈浅蓝灰色,纤柱状;硬柱石无色,多呈团块状,较均匀地与蓝闪石混杂分布。电子探针分析表明,蓝闪石主要为铁蓝闪石和青铝闪石,硬柱石为较典型的硬柱石。硬柱蓝闪片岩呈(透镜状)构造岩块分布,与围岩呈断层接触,原岩主要为变质玄武岩及少量辉(长)绿岩、基性火山碎屑岩,围岩为变质砂岩、板岩和少量碳酸盐岩。红脊山硬柱蓝闪片岩带伴有构造混杂岩发育,二者共存构成红脊山地区北羌塘甜水河陆块与南羌塘查多岗日陆块之间的分界线。
The glaucophane + lianoid is the typical low-temperature and high-pressure metamorphic mineral assemblage in the hard-column-blue flash schistosity zone that was first discovered in the northwestern part of the northern Qiangtang in Hongjiashan. Blue amphibole was light blue-gray, fiber columnar; colorless columnar, mostly clumps, more evenly mixed with glaucophane. Electron probe analysis showed that the glaucophane is mainly acetylenic blue and amphibole, and the diorite is the more typical type of hard stone. The hard column blue flash schist is (lenticular) tectonic block distribution and is in contact with the surrounding rock. The original rock is mainly metamorphic basalts and a small amount of feldspar (long) green rock and basaltic pyroclastic rocks. The surrounding rock is metamorphic sandstone, Slate and a small amount of carbonate rock. The Hongjishan hard column blue flash schist belt is accompanied by tectonic mélange, which coexist to form the dividing line between the Tianshuihe block of northern Qiangtang in Hongjishan and the Chaduogangtian block in southern Qiangtang.