A shallow marine volcaniclastic facies model: an example from sedimentary rocks bounding the subaqueously welded Ordovician Garth - WJ, Howells - 1991 () Citation Context ...g of pyroclastic deposits in many stratigraphic successions is problematic, so that it becomes imperative to properly define ...
The mantle is the origin of this rock type. Igneous rocks are either intrusive or extrusive. Extrusive igneous rocks come from the mantle and reach the earth's surface usually in a volcanic eruption. Intrusive igneous rocks also originate in the mantle but cool before they reach the surface. ...
Rock usually contains different discontinuities such as joints, cavities, bedding planes, faults, and defects. In some cases when faults are not involved, the effect of discontinuities on rock fracture is limited to a certain extent. For example, in drilling and blasting, rocks can still be cons...
Analysis of host rock To better constrain depositional history, a single sample (~ 5 × 5 × 2 cm) of moderately-to-well consolidated sedimentary material, found next to the skeletons, was acquired for investigation. Thin section analysis showed the rock to be a matrix-supported, ...
as example,the underwater effusion model for the basalts in source rock sedimentary environment and the intrusion model for the gabbros in the shallow-buried source rocks are developed.The helpful effects of these two models on source rock's formation,hydrocarbon generation and expulsion are ...
Destruction and restoration processes of fossil oyster reef influenced by repeated large-scale waves: An example of Holocene Crassostrea gigas shellbeds ar... We tried to clarify the formative processes of the Holocene oyster shellbeds exposed along the eastern coast of Pashukurutou Lagoon in the ...
XU Changgui,GAO Yangdong,LIU Jun,PENG Guangrong,LIU Pei,XIONG Wanlin,SONG Penglin.Discovery and inspiration of large- and medium-sized glutenite-rich oil and gas fields in the eastern South China Sea: An example from Paleogene Enping Formation in Huizhou 26 subsag, Pearl River Mouth Basin....
The carbonate rock formations have obvious dual media characteristics, fracture development and good physical conditions, which are the main seepage channels and storage spaces for gas after the reconstruction of underground gas storage. The carbonate st
Geologically shale is a sedimentary rock that is predominantly comprised of very fine-grained clay particles deposited in a thinly laminated texture while the term tight formation refers to a formation consisting of extraordinarily impermeable, hard sandstone or carbonate rock. ...
nodules, the concentric layers are discontinuous, with noticeable differences between the two sides. The core (central particle) can be a fragment of an old nodule, a shark tooth, or a small rock fragment (basalt, limestone, etc.).Fig. 2.20shows different types of nuclei observed in CIOB ...