摘要
塔西南奥陶系玛列兹肯群地质时代及构造环境对揭示塔西南下古生界盆地演化具重要意义。通过塔西南奥陶系玛列兹肯群中恰特组、坎地里克组含砾石英粗砂岩岩石学、岩石地球化学研究表明,含砾石英粗砂岩中以单晶石英为主,主要化学组分含量变化较大,Al_2O_3=2.75%~14.99%、TiO_2=0.03%~0.82%、TFe_2O_3=0.78%~10.58%、MgO=0.23%~4.93%、CaO=0.16%~7.16%、K_2O=0.05%~1.89%、Na_2O=1.33%~3.15%;∑REE为23.23×10^(-6)~98.02×10^(-6)、L/H=1.80~3.93、δEu=0.35~1.05、δCe=0.55~0.59。岩石地球化学特征指示,恰特组早期具洋岛型、逐渐向洋岛与大陆岛弧过渡至坎地里克组克拉通盆地成熟物源区的演化特征。
The tectonic settings of Malieziken Gropes in Ordovician can provide an important implication on the LowerPaleozoic sedimentary basin evolution in Southwestern Tarim.This paper reports sedimentary rock features, petrogeochemistrycharacteristics of gravel-bearing sandstones of Qiate formation and Kandilike formation, Ordovician MaliezikenGropes in Southwestern Tarim.The preliminary results obtained by the authors indicate that gravel-bearing sandstonesmainly consist of single-crystal quartz,and cobble-bearing sandstones varies in the great contents of the major geochemicalcomposition with Al2O3=2.75% ~14.99% ,TiO2=0.03% ~0.82% ,Fe2O3=0.78% ~10.58% ,MgO=0.23% ~4.93% ,CaO=0.16%~7.16%,K2O=0.05%~1.89%,Na2O=1.33%~3.15%,ΣREE=23.23×10-6~98.02×10-6、L/H=1.80~3.93、δEu=0.35~1.05、δCe=0.55~0.59.The petrogeochemistry characteristics inferred that the primitive gravel-bearing sandstones of Qiate formationderived from oceanic island to the transition zone,i e. between oceanic island and Continental igneous island arc,while the Kandilike formation origin from igneous island arc to internal craton.
出处
《新疆地质》
CAS
CSCD
2016年第2期245-249,共5页
Xinjiang Geology
基金
"973"(2012CB214802)
国家重大专项(2011ZX05005-0023)
2011ZX05008-003-11
中国石化科技部项目P10023联合资助
关键词
塔西南
玛列兹肯群
含砾石英粗砂岩
岩石地球化学
Gravel-bearing sandstones
Petrogeochemistry
Malieziken Grope
Southwestern Tarim
