Discovery of Permian island-arc basalts in the Cenxi area and the tectonic significance──A piece of evidence for the paleo-Tethyan tectonic belt in western Guangdong and eastern Guangxi

Cenxi Permian basalts are the late Palaeozoic island-arc type basalts first found in South China. REE and trace element characteristics and distribution patterns show that this volcanic formation, which has been isotopically dated at 261 MaB.P. by the 39Ar/ 40Ar method, is of an active continental marginal island arc type, and that the tectonic environment at that time was an island-arc marginal sea or minor ocean basin related with the paleo-Tethyan tectonic belt in western Guangdong-eastern Guangxi.     

Discovery of Permian islandarc basalts in the Cenxi area and the tectonic significance

Cenxi Permian basalts are the late Palaeozoic island-arc type basalts first found in South China. REE and trace element characteristics and distribution patterns show that this volcanic formation, which has been isotopically dated at 261 MaB. P. by the³⁹Ar/⁴⁰Ar method, is of an active continental marginal island arc type, and that the tectonic environment at that time was an island-arc marginal sea or minor ocean basin related with the paleo-Tethyan tectonic belt in western Guangdongeastern Guangxi.     

东秦岭耀岭河群火山岩的初步研究

耀岭河群火山岩为一套海底喷溢的细碧角斑岩,依据对其地质学、岩相学及主元素和微量元素地球化学特征的研究,认为它们为岩浆成因,在震旦纪晚期形成于扬子地合北缘的断陷盆地中。     

拉拉铜矿床含矿岩系岩石学特征及其变质原岩

通过对拉拉铜矿床含矿岩系变质岩的岩石学特征、岩石化学和稀土元素特征的深入研究,同时结合多种判别和统计分析,认为其变质条件为绿片岩相,变质原岩为一套以细碧角斑质火山碎屑岩为主和细碧角斑岩与正常沉积的泥质岩、泥质粉砂岩及碳酸盐岩的复杂组合。