Peralkaline volcanicity on the Eurasia Basin margin

Nature ◽  
1981 ◽  
Vol 294 (5837) ◽  
pp. 150-152 ◽  
Author(s):  
D. J. Batten ◽  
P. E. Brown ◽  
P. R. Dawes ◽  
A. K. Higgins ◽  
B. Eske Koch ◽  
...  
Keyword(s):  
Eurasia Basin ◽  
Basin Margin

scholarly journals Rift magmatism on the Eurasia basin margin: U–Pb baddeleyite ages of alkaline dyke swarms in North Greenland

2015 ◽  
Vol 172 (6) ◽  
pp. 721-726 ◽  
Author(s):  
Sigurjón B. Thórarinsson ◽  
Ulf Söderlund ◽  
Arne Døssing ◽  
Paul M. Holm ◽  
Richard E. Ernst ◽  
...  
Keyword(s):  
Dyke Swarms ◽  
Eurasia Basin ◽  
Basin Margin ◽  
North Greenland

Lake-mire deposition, earthquakes and wildfires along a basin margin fault; Rønne Graben, Middle Jurassic, Denmark

2010 ◽  
Vol 292 (1-2) ◽  
pp. 103-126 ◽  
Author(s):  
Lars Henrik Nielsen ◽  
Henrik I. Petersen ◽  
Karen Dybkjær ◽  
Finn Surlyk
Keyword(s):  
Middle Jurassic ◽  
Basin Margin

Grenville iron-formations and associated stratiform zinc mineralization, Roddick Lake area, Mount Laurier Basin, Quebec

1982 ◽  
Vol 19 (8) ◽  
pp. 1670-1679 ◽  
Author(s):  
Alex C. Brown
Keyword(s):  
Lake Area ◽  
Western Margin ◽  
Iron And Zinc ◽  
Iron Deposits ◽  
Iron Formations ◽  
Basin Margin ◽  
Zinc Deposits

Small iron-formations in Grenville metasediments have been examined as possible lateral stratigraphic equivalents of stratiform zinc deposits located along the western margin of the Mount Laurier Basin in the Maniwaki–Gracefleld area, Quebec. Similarities in carbonate and amphibolite units hosting the iron and zinc deposits tend to confirm this concept. Sphalerite sparsely disseminated along a dolomitic bed adjacent to the iron-formations, and the iron-formations themselves, are interpreted as the distal extremities of the massive sphalerite lenses found in the proximity of thick amphibolitic strata close to the (fault-bounded?) basin margin. A submarine exhalative model generating proximal zinc and distal iron deposits is proposed to explain this metal zoning. Originally the iron-formations probably consisted of sedimentary siderite that has been transformed under intense metamorphism to the present magnetite–graphite assemblage.

The Effect of Diagenetic Evolution on Shale Gas Exploration and Development of the Longmaxi Formation Shale, Sichuan Basin, China

2021 ◽  
Vol 9 ◽  
Author(s):  
Jia Wang ◽  
Xianfeng Tan ◽  
Jingchun Tian ◽  
Long Luo ◽  
Xuanbo Gao ◽  
...  
Keyword(s):  
Shale Gas ◽  
Sichuan Basin ◽  
Pore Space ◽  
Ion Beam ◽  
Central Basin ◽  
Burial History ◽  
Longmaxi Formation ◽  
Diagenetic Evolution ◽  
Basin Margin ◽  
Exploration And Development

Diagenetic evolution is an important controlling factor of shale gas reservoirs. In this study, based on field outcrop and drilling core data, analytical techniques including X-ray diffraction (XRD), field emission scanning electron microscope combined with a focused ion beam (FIB-FESEM), and energy-dispersive spectroscopy (EDS) analyses were performed to determine the diagenetic evolution of the Longmaxi Formation shale and reveal the effect of diagenetic evolution on the shale gas exploration and development in the Sichuan Basin, Southwest China. The eodiagenesis phase was subdivided into two evolution stages, and the mesodiagenesis phase was subdivided into three evolution stages in the basin margin and center. Absorbed capacity and artificial fracturing effect of the Longmaxi Formation shale gas were related to mineral composition, which was influenced by sedimentary characteristics and diagenetic evolution. The diagenetic system in the basin margin was more open than that in the basin center due to a different burial history. The more open diagenetic system, with more micro-fractures and soluble constitute (e.g., feldspar), was in favor for the formation and preservation of secondary dissolved pores and organic pores in the basin margin. The relatively closed diagenetic system with stronger compaction resulted in deformation of pore space in the central basin.

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