LATE CRETACEOUS DUCTILE DEFORMATION, METAMORPHISM AND PLUTONISM IN THE PIUTE MOUNTAINS, EASTERN MOJAVE DESERT

被引:25
作者
FLETCHER, JM
KARLSTROM, KE
机构
来源
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS | 1990年 / 95卷 / B1期
关键词
D O I
10.1029/JB095iB01p00487
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Late Cretaceous deformation in the Piute Mountains involved ductile thrusting on a network of anastomosing northeast and southwest directed shear zones. The shear zones often separate Proterozoic lithologies with strong competency contrasts, suggesting that Proterozoic crustal anisotropies were important in controlling the geometry of the shear zone network. Shear zones now divide the crust into wedge- and lozenge-shaped blocks. The Piute Mountains can be separated into two kinematic domains, each characterized by a dominant sense of shear. Peak metamorphic grade increases from upper greenschist facies in the north to upper amphibolite facies as the Lazy Daisy pluton is approached. All penetrative deformation ended before 72-71 Ma, by which time the area had cooled to below 300°C. -from Authors
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页码:487 / 500
页数:14
相关论文
共 66 条
[61]  
STONE P, 1983, GEOL SOC AM BULL, V94, P1135, DOI 10.1130/0016-7606(1983)94<1135:COMPSO>2.0.CO
[62]  
2
[63]  
SUPPE J, 1983, AM J SCI, V283, P648
[64]   HYDROLYTIC WEAKENING OF EXPERIMENTALLY DEFORMED WESTERLY GRANITE AND HALE ALBITE ROCK [J].
TULLIS, J ;
YUND, RA .
JOURNAL OF STRUCTURAL GEOLOGY, 1980, 2 (04) :439-451
[65]  
TULLIS J, 1982, STRUCT GEOL DIV GEOL
[66]  
WOODEN JL, 1988, GEOL SOC AM ABSTR, V20, P243