کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4733814 | 1357053 | 2008 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Complex deformation during arc-continent collision: Quantifying finite strain in the accreted Alisitos arc, Peninsular Ranges batholith, Baja California
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The Early Cretaceous Alisitos island arc, located in the western part of the Peninsular Ranges batholith, Baja California, accreted to North America during the mid-Cretaceous. A syn- to post-collisional fold-thrust belt dominated by sinistral transpression and orthogonal convergence developed along the northern and eastern edges of the arc, respectively. Field observations across the fold-thrust belt show a deformation gradient with stronger planar and linear fabrics, fold tightening, and greater finite strain towards the arc-continent suture. Flattening strains dominate and finite strain intensity ranges from 0.08 to 2.71 and generally increases towards the suture. In detail, the fold-thrust belt narrows southward from â¼12Â km to â¼3Â km. Furthermore, finite strain is heterogeneous reflecting a heterogeneous fold-thrust belt characterized by local high strain zones near faults, folds, and igneous intrusions. Finite strain data and field observations allow several conclusions: (1) the colliding arc deformed significantly as a result of collision; (2) strain contributes to bulk shortening and crustal thickening in the collision zone; (3) geometry, composition, and tectonic setting of the continental margin prior to collision control along-strike variations in the fold-thrust belt; and (4) narrowing of the fold-thrust belt southward is offset by increased deformation in continental margin units.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Structural Geology - Volume 30, Issue 2, February 2008, Pages 220-236
Journal: Journal of Structural Geology - Volume 30, Issue 2, February 2008, Pages 220-236
نویسندگان
H. Alsleben, P.H. Wetmore, K.L. Schmidt, S.R. Paterson, E.A. Melis,