volcanic arc

At the Paleo-Mesoproterozoic era, the meta-basic-ultrabasic rocks on eastern Hainan are oceanic low K arc tholeiite with the features of mafic-basaltic komatiite evidently, originated from highly depleted mantle and are formed under the tectonic setting of volcanic arc.

古中元古代时，琼中屯昌变基性-超基性岩，为大洋型火山岛弧低钾拉斑玄武岩，明显具有镁铁质-玄武质科马提岩特征，来源于高度亏损的地幔；

Metamorphic basement of the jiangnan Proterozoic Paleo-island arc mainly consists of low-grade metamorphic volcanic sedimentary rocks.

江南元古宙古岛弧的基底变质岩主要由浅变质的岛弧火山—沉积岩系组成.

Their original rocks are volcanic rocks, epicontinental clastic sedimentary rocks, and ophiolite of volcanic and island arc tholeiitic series or calcium alkali series.

其原岩岩石类型有火山岩，陆缘碎屑沉积岩，火山、岛弧拉斑系列或钙碱系列火山岩、蛇绿岩等。

The pluton formed in a extrusion setting, the post-collision tectonic stage, in other words, that is volcanic arc areas of the mainland.

扎合岩体形成的构造背景为后碰撞阶段的挤压环境，即大陆火山弧地区。

Is There a Neo-Tethys'Subduction Record Earlier than arc volcanic rocks in the Sangri Group?

存在比桑日群弧火山岩更早的新特提斯洋俯冲记录 么 ?

Qm-F-Lt, Qt-FL triangular diagram show that sandstone componental particles mainly falling into recycling orogenic zone, a very small amount into recycling of orogenic belts and volcanic arc mixing zone, indicating that there were overall more intensive tectonic activities of south depression in the Paleogene. 5.

Qm-F-Lt，Qt-F-L三角图解显示，南部坳陷的砂岩颗粒组分落入再旋回造山带，极少量落入再旋回造山带与岩浆岛弧混合带，说明古近纪南部坳陷构造活动整体比较强烈。

Furthermore, the granite samples are located at volcanic arc granite area ( VAG ) in trace discrimination diagram.

此外, 在微量元素构造环境判别图解上,花岗岩样品都落在 岛弧 区.