greywacke

The petrological-chemical analysis of clastic sedimentary rocks from Quantou Formation , Cretaceous indicates that their lithology mainly consists of arkose , shale and minor rock debris sandstone and greywacke by chemical classification of bulk elements .

通过对白垩系泉头组碎屑沉积岩岩石样品的岩石化学分析表明：主元素化学分类结果主要为长石砂岩、页岩，少量岩屑砂岩和硬砂岩；

The sediments are detrital and largely of greywacke facies .

沉积岩为碎屑质，大部分属于杂质砂岩相

The sedimentary members are largely turbidites of greywacke facies .

沉积岩的组成大部分为杂砂岩相的浊积岩。

Post-diagenetic variations related to the reservoir features include : ( 1 ) Primary porosity of greywacke is sharply reduced during burial-diagenesis ;

岩屑砂岩与储层物性相关的主要成岩后生变化有：（1）埋藏压实作用使碎屑岩原生孔隙大量减少；

Magma source is probably rising and emplacement of partially melt granitic magma dominated by greywacke , which is typical of crustal genesis .

岩浆源区可能是以杂砂岩成分为主的沉积岩部分熔融形成的花岗质岩浆上升侵位形成的，是一种典型的壳源成因类型。

The lithology of the reservoir is mainly fine-middle grain of lithic greywacke and feldspathic litharenite .

储层岩性以细-中粒岩屑长石、长石岩屑砂岩为主。

The analysis of constant elements in the sandstone indicates that the majority of sandstones are composed of greywacke , belonging to the turbidite in a flysch basin .

砂岩的常量元素分析结果表明，大部分砂岩为杂砂岩，属于复理石盆地的浊积岩范畴；

The protoliths of the garnet amphibolite can be either basic magmatic rocks , such as basalt and gabbro , or sedimentary rocks , like greywacke .

石榴角闪岩的原岩既可以是基性岩，如玄武岩或辉长岩，也可以是沉积岩如杂砂岩。

Zircon U-Pb dating and geochemistry of clastic sedimentary rocks in the Gonghe-Huashixia Area , Qinghai Province and their geological implications The sediments are detrital and largely of greywacke facies .

青海共和&花石峡三叠纪碎屑沉积岩的地球化学特征与锆石U-Pb年龄及地质意义沉积岩为碎屑质，大部分属于杂质砂岩相。