Tarim Basin is the largest Petroliferous basin in China, while its shale gas development potential has not been fully revealed. The organic-rich black middle Ordovician Heituao Formation from Tadong low uplift of considered as an important source rock and characteristic large thickness, high organic matter content thermal maturity degree. To obtain potential, geochemical, mineralogical mechanic...

In this study, twenty-six core shale samples were collected from the marine Lower Paleozoic in a well northeastern margin of Yangtze Platform. Analyses TOC content, mineral composition, major elements, along with trace and rare earth elements conducted on samples. The results used to investigate depositional conditions their effects organic matter accumulation preservation. Generally, sedimenta...

Early Paleozoic bottom waters were mainly ferruginous, like the Neoproterozoic, with a shift to increased euxinia in Devonian.

Van der Plmjm, B.A., 1987. Timing and spatial distribution of deformation in the Newfoundland Appalachians: a “multi-stage collision” history. In: H.J. Zwart, M. Martens, I. van der Molen, C.W. Passchier, C. Spiers and R.L.M. Vissers (Editors), Tectonic and Structural Processes on a Macro-, Mesoand Micro-Scale. Tectonophysics, 135: 15-24. The Newfoundland Appalachians have been interpreted as a...

based on the study of brachiopods and conodents a stratigraphic and relative age determination research has been worked out on the paleozoic sediments, located in south of bojnod,northeas of iran.for the first time the sediments of upper ordevician have been recognized in iran, based on some index fossils of brachiopods and conodonts. fourteen species of upper ordovician brachiopods and 12 spec...