Relationship between basic characteristics of daning pluton and its mineralization 大宁岩体的基本特征及其与成矿作用的关系
2.
The zircon u - pb ages of three major plutons are 481 ma , 461 ma and 452 ma respectively 获锆石u - pb年龄值为442ma ,为晚奥陶世。
3.
Fabric features of quartz and strain analysis on gneissic granite pluton in shuanghe , dabie 大别山双河片麻状花岗岩岩体石英组构特征及应变分析
4.
Fission track geochronology of xiaonanchuan pluton and the morphotectonic evolution of eastern kunlun since late miocene 东昆仑山小南川岩体裂变径迹年代与中新世晚期以来的构造地貌演化
5.
It agrees with the fact that the gabbro is intruded by late ordovician granitic pluton . the pre - sinian basement strata exposed in the north kunlun massif are later archean - neoproterozoic milan group , changcheng system kaqiang group , jixian system liushui formation and qingbaikou system sulu formation 被蛇绿岩所分隔的昆北地块上出露的前震旦纪基底地层为:晚太古代-新元古代米兰岩群,长城系卡羌岩群,蓟县系流水岩组和青白口系丝路岩组。
6.
The lower paleozoic strata in the south kunlun massif are kulafuhe group of cambbrian - ordovician . they consists of metamorphic detrital rocks , limestone , magnetite - bearing basalt , quartzite ( meta - silicalite ) , which suggests that they might form at active continent margin . the geochemical characteristics of volcanic and detrital rocks do indicate that they might form at an active marginal environment such as island arc etc . associated with the qimanyuter ophiolite suit , there are lots of early paleozoic granitic plutons 在昆南地块上的早古生代地层为寒武?奥陶系库拉甫河岩群,由变碎屑岩、灰岩、含磁铁矿玄武岩、石英岩(变硅质岩)等组成,显示其比昆北地块有较大的活动性,火山岩和碎屑岩的岩石地球化学特征也反映为岛弧及活动边缘环境。
7.
The fault controlled the magmatism and metallization relevant to the contact zone , and deformed successively and produced cataclastic rocks and two sets of joints ; the second stage was from late cretaceous to eocene . the fault zone deformed right - laterally under ne - sw striking transtention , and new joints zone was produced at the end of the two main faults because of local stress concentration . the fault produced inchoative cataclastic rocks , and two sets of typical joints in plutons ; the third stage of deformation was relatively faint and only a little of microcracks was produced and infilled with vei ns in the deformed rocks , which was during the himalayan movement 其后的继承性活动在断裂带内形成碎裂程度最强达到碎裂岩的碎裂岩系列构造岩,变形带两侧发育两组典型的共轭剪节理;第二次在晚白垩世?始新世,断裂在北东?南西向近水平挤压作用下右行张扭性活动,断裂带两主断裂在斜列重叠的端部由于局部应力集中进一步扩展形成节理带,而断裂在岩体区也发育两组典型的共轭剪节理,断裂内形成初碎裂岩为主的构造岩;第三次是喜山期以西侧抬升、东侧下降的强烈升降为主的活动,在基岩中,主断层两侧围岩出现微破裂。
8.
The cataclastic rocks appeared in the fault zone include structural lenticles , fault breccias , protocataclasite and cataclasite . the microscopical cataclastic deformation mechanisms involved are microcracking , frictional sliding and pressure - solution , but there might have had ductile deformation relating to dislocation sliding in feldspar and quartz of the plutons 断裂带内碎裂岩系列构造岩主要是碎裂化岩石(包括构造透镜体和构造角砾岩) 、初碎裂岩和碎裂岩,显微变形机制主要有破裂作用、摩擦滑动和压溶作用。
9.
In terms of their geological and geochemical characteristics as well as the ages of these plutons , these three sub - belts from south to north are interpreted as syn - subductional , syn - collisional and post - collisional plutons respectively . composed of quartz diorite and quartz monzonite , the syn - subduction plutonic rocks are confined only to the south kunlun massif 俯冲期侵入岩仅出露于蛇绿岩带之南的昆南地块上,岩性组合为石英闪长岩-石英二长岩,三个主要岩体获锆石u - pb年龄值为481ma 、 461ma 、 452ma ,均为奥陶纪。