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Author : Max D. Crittenden,Peter J. Coney,George Herbert Davis,George Hamilton Davis
Publisher : Geological Society of America
Page : 497 pages
File Size : 52,8 Mb
Release : 1980
Category : Science
ISBN : 9780813711539
Author : George H. Davis,Eytan Bos Orent,Christopher Clinkscales,Felipe R. Ferroni,George E. Gehrels,Sarah W.M. George,Katherine A. Guns,Catherine E. Hanagan,Amanda Hughes,Alexander Iriondo,Gilby Jepson,Clay Kelty,Robert W. Krantz,Brandon M. Levenstein,Steve H. Lingrey,Daniel P. Miggins,Timothy Moore,Samantha E. Portnoy,Lauren Reeher,Jordan W. Wang
Publisher : Geological Society of America
Page : 138 pages
File Size : 49,9 Mb
Release : 2023-08-28
Category : Science
ISBN : 9780813712222
Author : Donna Whitney,Christian Teyssier,Christine S. Siddoway
Publisher : Geological Society of America
Page : 404 pages
File Size : 40,9 Mb
Release : 2004-01-01
Category : Science
ISBN : 9780813723808
Author : Mason L. Hill
Publisher : Geological Society of America
Page : 490 pages
File Size : 51,9 Mb
Release : 2013-08-01
Category : Science
ISBN : 9780813754079
One of six volumes generated by each GSA section for the Decade of North American Geology (DNAG) project, this centennial field guide contains descriptions of 100 sites or site clusters representing outstanding geologic locations in Alaska, southern Arizona, California, Hawaii, Nevada, Oregon, Washington and British Columbia.
Author : Robert S. Hildebrand
Publisher : Unknown
Page : 84 pages
File Size : 47,6 Mb
Release : 2009
Category : Science
ISBN : 0813724570
Within the Sonora segment to the south, break-off magmatism was also prevalent. Both the Canadian and Sonoran segments have abundant porphyry copper mineralization temporally and spatially associated with the break-off magmas, which suggests a genetic link between slab failure and porphyry copper mineralization. By 53 Ma, eastwardly dipping subduction of Pacific Ocean crust was generating arc magmatism on the amalgamated Cordilleran collision zone in both the Canadian and Sonoran segments. Oceanic schists, such as the Orocopia-Pelona-Rand, were formed in the ocean basin west of Rubia and accreted during initiation of the new easterly dipping subduction zone. A major transform fault, called the Phoenix fault, connects the Sevier fold-thrust belt at the California-Nevada border with that in eastern Mexico and separates the Great Basin and Sonoran segments. It juxtaposes the Sierra-Mojave-Sonora block alongside the Transition Zone of the Colorado Plateau. Cordilleran events affected the subsequent development of western North America. For example, the structural Basin and Range Province appears to coincide with the region where exotic allochthons sit atop North American crust in both the Great Basin and Sonoran segments. Also, within the triangular Columbia embayment, large segments of Rubia appear to have escaped laterally during the Cordilleran orogeny to create a lithospheric "hole" that was later filled by basalt of the Columbia River and Modoc plateaux.
Author : Alison B. Till
Publisher : Geological Society of America
Page : 284 pages
File Size : 41,8 Mb
Release : 2007-01-01
Category : Science
ISBN : 9780813724348
Author : William R. Dickinson
Publisher : Geological Society of America
Page : 130 pages
File Size : 46,6 Mb
Release : 1991
Category : Science
ISBN : 0813722640
Mid-Tertiary strata exposed as tilted homoclines along the flanks of the San Pedro trough and across broad uplands north of the Catalina core complex are assigned to the following formations, each of which includes informal local members and facies: (a) Mineta Formation, mid-Oligocene redbeds including both conglomeratic fluvial and finer-grained lacustrine deposits; (b) Galiuro Volcanics, including lavas and domes, air-fall and ash-flow tuffs, and intercalated volcaniclastic strata of late Oligocene to earliest Miocene age; (c) Cloudburst Formation, also of late Oligocene and earliest Miocene age but including a sedimentary upper member of conglomeratic strata as well as a volcanic lower member correlative with part of the Galiuro Volcanics; and (d) San Manuel Formation, composed of lower Miocene alluvial fan and braidplain deposits that display contrasting clast assemblages in different areas of exposure. Generally correlative Oligocene-Miocene strata exposed south of the Catalina core complex are assigned to the Pantano Formation, which contains similar lithologic components. Less-deformed Neogene strata of post-mid-Miocene basin fill are assigned to the Quiburis Formation along the San Pedro trough, but stratigraphic equivalents elsewhere lack adequate nomenclature. High benchlands mantled by paleosols mark the highest levels of Neogene aggradation. Successive stages of subsequent erosional dissection are recorded by multiple terrace levels incised into basin fill. Key exposures of syntectonic mid-Tertiary sedimentary sequences in several local subareas reveal typical structural and stratigraphic relationships. Multiple fault blocks expose pre-Tertiary bedrock overlain by tilted mid-Tertiary strata confined to intervening half-grabens. Bounding syndepositional faults dip southwest and associated homoclines dip northeast. Fanning dips and buttress unconformities reflect progressive tilt and burial of eroding fault blocks. Dips of block-bounding faults are inversely proportional to the ages of the faults. Steeper dips for younger faults suggest either progressive erosion of successive listric faults or progressive rotation of successive planar faults. Uniformly moderate to steep dihedral angles between fault surfaces and offset homoclinal bedding imply that the faults dipped more steeply near the surface when syntectonic mid-Tertiary strata were subhorizontal. Although the inference of listric faulting best links apparent strands of the Catalina detachment system, the alternate interpretation of rotational normal faulting is compatible with local structural relationships including tilt of porphyry copper orebodies. Within the San Pedro trough, multiple homo clines of mid-Tertiary strata are exposed locally in tilt-blocks exhumed by Neogene erosion from beneath nearly flat-lying basin fill of the Quiburis Formation. Faults bounding the mid-Tertiary exposures include backtilted strands of the Catalina detachment system, somewhat younger listric or rotational normal faults, and steeper basin-range normal faults that display offsets both synthetic and antithetic to the flanks of the San Petro trough. In Cienega Gap, flanking the Tucson Basin, multiple tilt-blocks of the Pantano Formation form part of the upper plate of the Catalina detachment system. Initial construction of alluvial fans by generally westward paleoflow was followed by ponding of lacustrine environments along the foot of secondary breakaway scarps that also generated massive megabreccia deposits. In summary, syntectonic Oligocene to Miocene sedimentation succeeded a prominent pulse of polymodal mid-Tertiary volcanism and was coeval with mylonitic deformation and detachment faulting along the flank of the Catalina core complex. The headwall rupture for the detachment system migrated westward from an initial position along the range front of the Galiuro Mountains. After mid-Miocene time, accumulation and subsequent dissection of essentially undeformed basin fill was accompanied by basin-range block faulting. The most challenging structural issue is whether fault strands of the Catalina detachment system are interconnected or are disconnected rotational segments.
Author : Conall Mac Niocaill,P. D. Ryan,Paul Desmond Ryan
Publisher : Geological Society of London
Page : 358 pages
File Size : 52,6 Mb
Release : 1999
Category : Science
ISBN : 1862390517
Brings together a series of papers which explore various aspects of the deformation of continental lithosphere, covering different tectonic settings from the Palaeozoic to the present day. These include terrane accretion and juxtaposition, the exhumation of high-pressure terrains, and mechanisms of crustal extension and rifting.
Author : Larry Mayer
Publisher : Geological Society of America
Page : 131 pages
File Size : 41,8 Mb
Release : 1986-01-01
Category : Science
ISBN : 9780813722085
Author : Anonim
Publisher : American Geophysical Union
Page : 224 pages
File Size : 40,5 Mb
Release : 1998
Category : Desert ecology
ISBN : 9789780875909
Presents information from the primary abiotic forces defining the system, and from the present hydrology, biogeochemistry and physics of major sites of organic carbon production of the McMurdo Dry Valleys. Additionally, research on the physical, chemical, and biological properties of the dry valley soils is included. The role of environmental management in long-term ecological studies is also addressed. The accompanying CDROM provides details and scale to visualize the McMurdo Dry Valleys from an ecosystem perspective.
Author : Connie Manson,Debbie Burnetti
Publisher : Unknown
Page : 414 pages
File Size : 50,8 Mb
Release : 1983
Category : Geology
ISBN : STANFORD:36105032013786
Author : Steven J. Whitmeyer,Michael L. Williams,Dawn A. Kellett,Basil Tikoff
Publisher : Geological Society of America
Page : 824 pages
File Size : 48,9 Mb
Release : 2023-01-04
Category : Science
ISBN : 9780813712208
"This Memoir focuses on 7 'turning points' that had specific and lasting impacts on Laurentian evolution: The Neoarchean, characterized by cratonization; the Paleoproterozoic and the initial assembly of Laurentia; the Mesoproterozoic southern margin of Laurentia; the Midcontinent rift and the Grenville orogeny; (5) the Neoproterozoic breakup of Rodinia; the mid-Paleozoic phases of the Appalachian-Caledonian orogen; and the Jurassic-Paleogene assembly of the North American Cordillerar"--
Author : Anonim
Publisher : Unknown
Page : 472 pages
File Size : 42,9 Mb
Release : 1983
Category : Geology
ISBN : STANFORD:36105004638701
Author : Philip A. Pearthree
Publisher : Geological Society of America
Page : 128 pages
File Size : 50,7 Mb
Release : 2019-09-23
Category : Science
ISBN : 9780813700557
Author : M.H. Salisbury,David M. Fountain
Publisher : Springer Science & Business Media
Page : 658 pages
File Size : 41,9 Mb
Release : 2012-12-06
Category : Science
ISBN : 9789400906754
In the Fall of 1988, 64 geologists and geophysicists from 11 countries met in Killarney, Ontario, on the north shore of Lake Huron to examine evidence that suggests that the continental crust is exposed in cross-section at several key locations on the Earth's surface. The meeting, which was held under NATO auspices as an Advanced Study Institute, was a landmark event in that it was the first time that many of the lead scientists working on these complexes in relative isolation around the world had' ever gathered together to compare results. The present volume is a compendium of the invited lectures given on the principle sections, plus an array of supporting papers on these and other sections as well as on related topics such as crustal emplacement mechanisms, deformation and rheology. Nearly all of the best known sections are represented, including the Ivrea Zone, Calabria, the Kapuskasing Zone, Fiordland and many others. It is our hope that this Volume will serve as a reference for Earth scientists who are trying to understand levels of the crust not normally exposed to view, as well as a point of departure for new research and a teaching aid to new entrants in this relatively new field of study.