Magmatic-tectonic interaction during early Rio Grande rift extension at Questa, New Mexico
Author: J. MEYER
Publisher:
Published: 1991
Total Pages:
ISBN-13:
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Author: J. MEYER
Publisher:
Published: 1991
Total Pages:
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DOWNLOAD EBOOKAuthor: G. Randy Keller
Publisher: Geological Society of America
Published: 1994-01-01
Total Pages: 312
ISBN-13: 0813722918
DOWNLOAD EBOOKAuthor: Cathy J. Busby
Publisher: Geological Society of America
Published: 2023-04-11
Total Pages: 116
ISBN-13: 0813725607
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Publisher:
Published: 1983
Total Pages: 348
ISBN-13:
DOWNLOAD EBOOKAuthor: New Mexico Geological Society. Field Conference
Publisher:
Published: 1990
Total Pages: 476
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DOWNLOAD EBOOKAuthor: Cory Christian Paliewicz
Publisher:
Published: 2015
Total Pages: 298
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DOWNLOAD EBOOKNorth-northeast extension and bimodal magmatism during early Rio Grande rifting is recorded by the emplacement histories of two suites of dikes and associated plugs at Faulkner Canyon. Whole-rock geochemistry and 40Ar/39Ar data suggest that alkalic trachybasalts (34.7 +/- 1.1 Ma) and trachydacites (35.96 +/- 0.09 ma) were emplaced first and were followed by the emplacement of two petrogenetically distinct groups of calc-alkaline magmas consisting of basaltic andesite and andesite. Major and trace element compositions from these two suites indicate that Ne-normative trachybasalts (Nb/Ba = 0.057- 0.026) were likely derived from the asthenosphere and evolved to QTz-normative trachydacitic compositions by assimilation and fractional crystallization (AFC) of mid-lower crust. Calc-alkaline magmas (Nb/Ba = 0.006-0.013), however, were likely sourced from an enriched lithospheric mantle source and evolved independently. Spatial distribution of hypabyssal units suggest that magmas were emplaced as a series of laccolithic bodies that may have been elongated from a previously exsting zone of structural weakness possibly associated with the Texas Lineament. Although previous works suggest that early Rio Grande rift extension was oriented generally E-W during hypabyssal emplacement, localized stresses from the intrusions initially deformed the overlying Eocene Palm Park Formation into a broadly folded E-W trending anticline and sub-parallel joints that were filled by alkaline and calc-alkaline magmas.
Author: James E. Faulds
Publisher: Geological Society of America
Published: 1998-01-01
Total Pages: 269
ISBN-13: 081372323X
DOWNLOAD EBOOKThis volume focuses on the geometry, kinematic development, and origin of regional segmentation structures within the basin and range province of Western North America. Contributions range from analysis of individiual structures to broad regional syntheses, including a map of basin and range structures and tilt domains. Several papers discuss the implications of regional segmentation structures in assessing seismic hazards, hydrocarbon and mineral resources, and ground-water supplies.
Author: Charles Edward Chapin
Publisher:
Published: 1989
Total Pages: 508
ISBN-13:
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Published: 1992
Total Pages: 268
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DOWNLOAD EBOOKAuthor: Sarah J. Titus
Publisher:
Published: 2002
Total Pages: 352
ISBN-13:
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