Geological features of eclogite ore in the east of shangdong province 魯東榴輝巖礦地質(zhì)特征及開(kāi)發(fā)利用
This paper deals with high - and ultrahigh - pressure eclogite , its occurrence , classification , petrology and mineral features and metamorphism 摘要對(duì)區(qū)內(nèi)高壓超高壓榴輝巖的分布、分類(lèi),巖石、礦物特征,變質(zhì)作用特征進(jìn)行了系統(tǒng)研究。
Measurements of physical properties indicate that the rutile - bearing eclogite , due to its very high seismic velocity and density , can produce reflections and gravity anomalies 巖石物性測(cè)定表明,金紅石榴輝巖的縱波速度極高,會(huì)產(chǎn)生明顯的反射與重力異常。
Since eclogite and the coexisting high - pressure granulite have been found in western syntaxis , we ' ll ask whether it is possible that eclogite also can occur in eastern syntaxis 西構(gòu)造結(jié)已經(jīng)發(fā)現(xiàn)榴輝巖和與之共生的高壓麻粒巖,東構(gòu)造結(jié)是否也可能存在榴輝巖呢
The authors consider that high - pressure epidote - blueschist , high - pressure eclogite , and ultrahigh - pressure eclogite formed at the same time , but at different depths 認(rèn)為高壓綠簾藍(lán)片巖相、高壓榴輝巖相、超高壓榴輝巖相是在同一俯沖帶內(nèi)不同深度發(fā)生的同期變質(zhì)作用產(chǎn)物。
Southeast of the ccsd main hole , there are quite a few such reflectors , implying that eclogite bodies exist in the extension direction of the surface eclogite body 在ccsd主孔東南方深部重力高部位有多個(gè)這樣的拱形反射,預(yù)示在地表陡傾榴輝巖的延伸方向還有多個(gè)一定規(guī)模的隱伏榴輝巖體。
High - pressure granulite and the coexisting eclogite and coesite - bearing ultrahigh - pressure eclogite have been subsequently found in the western syntaxis since 80s " last century 自20世紀(jì)80年代以來(lái),西構(gòu)造結(jié)已經(jīng)發(fā)現(xiàn)了高壓麻粒巖,與高壓麻粒巖共生的榴輝巖和含柯石英的超高壓榴輝巖。
4 . it is the first time that eclogite conglomerates are discovered in maotangchan and fenghuangtai formations . this suggests that ultra - high pressure metamorphic rocks in the dabie orogenic belt exhumed to the earth ' s surface in lower cretaceous . the geochemistry data indicates that the protoliths of the eclogite gravels formed in a structure setting of volcanic arc 首次在毛坦廠組、鳳凰臺(tái)組中發(fā)現(xiàn)了榴輝巖礫石,這一發(fā)現(xiàn)表明大別造山帶超高壓變質(zhì)巖在早白堊世已經(jīng)折返到地表,而且地球化學(xué)研究表明這些榴輝巖礫石的原巖形成于巖漿島弧構(gòu)造背景。