摘要:

AbstractThe Carboniferous in Guizhou may be divided into 3 lithostratigraphic regions, 2 series and 7 stages. The Lower Carboniferous is composed of 4 regional stages, 1 foraminifer assemblage, 4 fossil coral zones (with 9 subzones) and 11 brachiopod assemblages; the Upper Carboniferous is divided into 3 regional stages, 9 fusulinid zones (with 2 subzones) and 4 ammonite zones. Based on the studies of foraminifers and conodonts, the base of the Carboniferous in Guizhou is placed at least near the top of the coralCystophrentiszone.

ISSN:1000-9515    

DOI:10.1111/j.1755-6724.1988.mp1002001.x

出版商:Geological Publishing House    

年代:1988

数据来源: WILEY

摘要:

AbstractListric faults of different levels and scales are widely developed in the lithosphere. According to their tectonomechanical geneses, the author divides listric faults into primary and secondary ones, and the former may be subdivided into gravity‐ gliding listric faults, regional extensional listric normal faults, regional contractional reverse listric faults and deep‐ seated ductile listric faults. By means of the slip‐ line field theory dealing with Mohr's criterion expressed by quadratic limiting curves, the author has preliminarily determined the occurrences, patterns and mechanical properties of various types of listric faults during their formation, and has analyzed their tectonic evolution and related dynamic processes in the lithos

ISSN:1000-9515    

DOI:10.1111/j.1755-6724.1988.mp1002002.x

出版商:Geological Publishing House    

年代:1988

数据来源: WILEY

摘要:

AbstractThere is a NE‐ trending earthquake hazard anomalous zone in the western part of the area of the city of Beijing proper. A comprehensive study of it has been made. In the study the two‐dimensional finite element dynamic analysis and supersonic seismic model experiments were conducted for the first time, and some preliminary results have been achieved.The Beijing depression, a lower order tectonic unit in the Beijing downwarp, is just located below the earthquake hazard anomalous zone. Analysis of the experimental results shows that the topography of the buried bedrock is the main factor responsible for the presence of the anomalous zone. Besides, the two‐dimensional mathematical analysis has more marked advantages in reflecting the lateral inhomogeneity of the foundation as compared with the one‐dimensional one, and the supersonic seismic model experiments may reflect the integrated effects of the earthquake sources, path of wave propagation and site geological structure in an all‐

ISSN:1000-9515    

DOI:10.1111/j.1755-6724.1988.mp1002003.x

出版商:Geological Publishing House    

年代:1988

数据来源: WILEY

摘要:

AbstractIn this paper, 183 chemical analyses of clinopyroxenes are collected from mantle‐derived inclusions in Cenozoic basalts of eastern China. Through synthetic studies of the relevant data, their mineral chemistry and geological significance are discussed. Based on the composition of clinopyroxenes the authors conclude that the Cenozoic upper mantle in eastern China is of the continental, primitive, metasomatic and high‐ temperature types and is related to rift structural environment and variation in composition of basalts. The geobarometry of clinopyroxenes indicates that Cenozoic basalts of eastern China are derived from the asthenosphere and that the average depth of faults progressively increases from south to north and from east to w

ISSN:1000-9515    

DOI:10.1111/j.1755-6724.1988.mp1002004.x

出版商:Geological Publishing House    

年代:1988

数据来源: WILEY

摘要:

AbstractThe theory of dissipative structures is applied in this paper to probing into the dynamics, temporal structures and spatial structures of ore‐ forming processes and the inherent relationships among them. Areas of ore formation are large dynamic systems in development and evolution. The core of ore formation is the “onset of ore‐ forming processes”, and the crux of it is the “transition from mineralization to ore formation”. The theory of bifurcation and theory of fluctuation make possible the access to the solution of this problem. The multiorder or successive bifurcation of dissipative structures introduces dynamic geochemical processes into geosciences and inverses the dynamic evolution and temporal rhythms of ore‐ forming processes. The localization of dissipative structures introduces dynamic geochemical fields into geosciences and brings to light the causes and mechanisms of the formation and development of geochemical areas of ore formation (regions and zones of ore formation) and their spatial dyn

ISSN:1000-9515    

DOI:10.1111/j.1755-6724.1988.mp1002005.x

出版商:Geological Publishing House    

年代:1988

数据来源: WILEY

摘要:

AbstractMost of the sulfide nickel deposits in China occur on the margins of platforms and their outer mobile belts. The ore‐ bearing basic‐ ultrabasic rock bodies were formed in the Proterozoic and Variscan. The types of metallogenic rock bodies include ultrabasic‐ basic complexes related to volcanism in eugeosynclines and ultrabasic rock bodies, ultrabasic‐basic complexes and basic rock bodies related to deep fractures. On the basis of ore‐forming processes and modes, nickel sulfide deposits of China may be divided into two major types: in‐ situ magmatic liquid unmixing deposits and deep‐ seated magmatic liquid unmixing injection deposits. The latter may by subdivided into four types: single injection deposits, multiple injection deposits, and pulsatory injection depositis, and late injection deposits which may inject into either comagmatic rocks or other kinds of country rocks.Two metallogenic models for nickel sulfide deposits are proposed

ISSN:1000-9515    

DOI:10.1111/j.1755-6724.1988.mp1002006.x

出版商:Geological Publishing House    

年代:1988

数据来源: WILEY

摘要:

AbstractThe geology of loess in China involves many problems. This paper deals only with the basic ones of the origin of loess, the geologic setting and palaeoenvironmental evolution leading to the formation of the Loess Plateau, and the regional stratigraphy of loess deposits, particularly the last problem. A better knowledge of the formation and development of the loess deposits in China has been obtained through analysis and correlation of lithostratigraphy, biostratigraphy, magnetostratigraphy, climatostratigraphy and chronostratigraphy.

ISSN:1000-9515    

DOI:10.1111/j.1755-6724.1988.mp1002007.x

出版商:Geological Publishing House    

年代:1988

数据来源: WILEY

摘要:

AbstractOn the basis of Navier‐Stokes equation, a digital analogue of crossing flow is carried out by means of finite element analysis performed through penalty function formulation. The results of the digital analogue are in good agreement with that of the previous hydraulic physical simulation. They both demonstrate the effect of “deflection flow” occurring at the fracture intersection that the fracture‐ water crossing flow deflects Δqinto the wide

ISSN:1000-9515    

DOI:10.1111/j.1755-6724.1988.mp1002008.x

出版商:Geological Publishing House    

年代:1988

数据来源: WILEY