气候变化领域集成服务门户(CCPortal): Calcite twinning strains from syn-faulting calcite gouge: small-offset strike-slip; normal and thrust faults

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DOI	10.1007/s00531-019-01783-x
	Calcite twinning strains from syn-faulting calcite gouge: small-offset strike-slip; normal and thrust faults
	Craddock J.P.; Malone D.H.; Wartman J.; Kelly M.J.; Junlai L.; Bussolotto M.; Invernizzi C.; Knott J.; Porter R.
发表日期	2020
ISSN	14373254
卷号	109 期号:1
英文摘要	We have evaluated the stress–strain behavior of calcite precipitated and mechanically twinned in small-offset strike-slip, normal and thrust faults of a variety of ages and from a variety of tectonic settings (n = 3001 twin measurements, 63 strain analyses from 18 field sites). Five strike-slip faults with syn-faulting, horizontally striated calcite (rake = 0°) were studied and we report the orientations of the contemporaneous stress–strain field associated with each fault: intrusion of the Marathon Large Igneous Province mafic dikes (~ 2.1 Ga in Archean crust, Minnesota, USA); post-Keweenaw rift (1.1 Ga) faulting (Island Lake fault, central Ontario, Canada); subduction associated with metamorphic core complex formation (Cretaceous, China); subduction (Cretaceous to Miocene, Italy), and continental extension (recently active Furnace Creek fault, Death Valley, California, USA). Seven normal faults with synfaulting, dip-slip striated calcite were studied and are from the following tectonic settings: a normal fault slip surface in an Ordovician Piedmont fold, Appalachian’s; paleo-subduction associated with Cretaceous metamorphic core complex formation (China, 3 sites); the paleo-extensional Atlantic margin (~ 55 Ma, Ireland, 1 site with a U–Pb calcite age); continental extension (1 active site, Mojave desert); a transcurrent margin (Jamaica, 1 active fault site), and subduction [2 active faults along the Eur-African margin in Italy (with calcite U–Th disequilibria ages) and Crete, respectively]. Six thrust fault examples are all from convergent orogenic settings: the basal thrust of the Penokean (1850 Ma) fold-and-thrust belt; the Penokean orogen foreland in Mesabi Range banded iron formation folds; an offset breccia body in the Permian Gondwanide belt, Ellsworth Mountains, Antarctica; the frontal thrust of the Gondwanide Cape belt, South Africa; the Paleocene frontal Prospect thrust, Sevier belt, Wyoming, and an Alpine foreland back-thrust, Lulworth Cove, U.K. For each strike-slip fault system the twinning shortening strain is horizontal and at an angle of 0°–60° to the respective fault plane (dextral or sinistral) although in the majority of cases the shortening axis is parallel to fault strike (13 of 23 results). In each normal fault example, dip-slip kinematic striations dominate the faulted surface yet the orientation of the maximum principal compressive stress (σ1) and shortening strain axis (ε1) are not 45° to the fault plane as predicted but are sub-horizontal and either strike-parallel (25 of 35 results) or strike-normal (10 of 35 results). Thrust faults preserve shortening strain axes parallel to the dip-slip kinematic direction, within the fault plane (plane strain) and not at 45° to the principal plane (5 of 5 results). None of the fault stress–strain field results reported here support the Andersonian or Mohr–Coulomb criteria for stress–strain relations predicted along faults. © 2019, Geologische Vereinigung e.V. (GV).
英文关键词	Calcite strain analysis; Fault mechanics
语种	英语
scopus关键词	banded iron formation; breccia; calcite; fold and thrust belt; igneous intrusion; normal fault; strain analysis; strike-slip fault; subduction; tectonic setting; thrust fault; twinning; Andersonia
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147734
作者单位	Geology Department, Macalester College, St. Paul, MN 55105, United States; Department of Geography-Geology, Illinois State University, Normal, IL 61790-4400, United States; Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN 55118, United States; State Key Laboratory of Geological Processes and Mineral Resources and Key Laboratory of Lithosphere Tectonics, China University of Geosciences, 29 Xueyuan Rd, Beijing, China; 17 Rue Descartes, Villeurbanne, 69100, France; School of Science and Technology - Geology Division, University of Camerino, Camerino, Italy; Department of Geological Sciences, CSU Fullerton, 800 N. State College Blvd, Fullerton, CA 93834, United States; School of Earth Sciences and Environmental Sustainability, Northern Arizona University, Flagstaff, AZ, United States; Minnesota Department of Natural Resources, St. Paul, MN, United States
推荐引用方式 GB/T 7714	Craddock J.P.,Malone D.H.,Wartman J.,et al. Calcite twinning strains from syn-faulting calcite gouge: small-offset strike-slip; normal and thrust faults[J],2020,109(1).
APA	Craddock J.P..,Malone D.H..,Wartman J..,Kelly M.J..,Junlai L..,...&Porter R..(2020).Calcite twinning strains from syn-faulting calcite gouge: small-offset strike-slip; normal and thrust faults.International Journal of Earth Sciences,109(1).
MLA	Craddock J.P.,et al."Calcite twinning strains from syn-faulting calcite gouge: small-offset strike-slip; normal and thrust faults".International Journal of Earth Sciences 109.1(2020).