Basement Rocks and Structural Evolution of Southern Oklahoma
Basement Rocks and Structural Evolution of Southern Oklahoma
复制标题
俄克拉荷马州南部的基底岩石和结构演化
DOI：
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发表时间：
1965
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影响因子：
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通讯作者：
W. E. Ham
中科院分区：
文献类型：
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作者：
W. E. Ham
俄克拉荷马州南部17，000平方英里地区的基底岩石出现在威奇托和阿巴克尔山脉，并已在175口威尔斯井的地下样本中进行了研究。岩石被分为两个对比鲜明的省，每个省在年龄和岩石学特征上完全不同。各省对上覆古生代地层的地层和构造演化起着不同的引导作用。较老的或东部的阿巴克尔地区主要是前寒武纪块状花岗岩，同位素年龄为10.5亿~ 13.5亿年。它们是一个广阔的大陆克拉通的一部分，其上的古生代沉积物很薄，只受到轻微的扰动，主要是轻微的褶皱和块断。较年轻的或威奇托省的基底岩石可能是早寒武世和中寒武世的沉积物、流动物和侵入火成岩。沉积物和水流由杂砂岩、层状燧石、细碧玄武岩和流纹岩组成。正如钻探和支持地震数据所示，这些骨架岩石在克拉通上的一个细长的下弯内积累了大约20，000英尺的厚度。下弯向西北方向延伸了一条100英里宽300英里长的带状地带.它主要局限于俄克拉荷马州西南部和北方得克萨斯州，但可能继续向东-
Basement rocks in the 17,000 square-mile r egion of southern Oklahoma crop out in the Wichita and Arbuckle Mountains and have been studied in subsurface samples f rom 175 wells. The rocks are divided into two contrasting provinces, each completely different from the other in age and petrologic character. Each province has played a different role in guiding the stratigraphic and structural evolution of overlying Paleozoic strata. The older or Eastern Arbuckle p rovince c onsists d ominantly of Precambrian massive granites isotopically d ated 1,050 to 1, 350 million years. They are part of an extensive continental craton, upon which the Paleozoic sediments are thin and have been only slightly disturbed, chiefly by gentle folding and block faulting. Basement rocks of the younger or Wichita Province are sediments, flows, and intrusive igneous rocks of probable Early and Middle Cambrian age. The sediments and flows consist of graywacke, bedded chert, spilitic basalt, and rhyolite. As shown by drilling and supporting seismic data, t hese framework rocks accumulated to a thickness of about 20,000 feet within an elongate downwarp upon the craton. The downwarp extends northwestward a long a belt 100 miles wide and 300 miles long. It is confined mainly to southwestern Oklahoma and northern Texas, but probably continues east-