scholarly journals Deformation process and kinematics of mélange in the Early Cretaceous accretionary complex of the Mino-Tamba Belt, eastern southwest Japan

Tectonics ◽  
2007 ◽  
Vol 26 (2) ◽  
pp. n/a-n/a ◽  
Author(s):  
Akiko Fukui ◽  
Ken-ichi Kano
Keyword(s):  
Early Cretaceous ◽  
Deformation Process ◽  
Accretionary Complex ◽  
Southwest Japan

scholarly journals K‐Ar Dating of Fossil Seismogenic Thrusts in the Shimanto Accretionary Complex, Southwest Japan

Tectonics ◽  
2019 ◽  
Vol 38 (11) ◽  
pp. 3866-3880 ◽  
Author(s):  
Donald M. Fisher ◽  
Satoshi Tonai ◽  
Yoshitaka Hashimoto ◽  
Naotaka Tomioka ◽  
David Oakley
Keyword(s):  
Accretionary Complex ◽  
Southwest Japan

scholarly journals The tectonic significance of the Early Cretaceous forearc-metamorphic assemblage in south-central Alaska based on detrital zircon U–Pb dating of sedimentary protoliths

2015 ◽  
Vol 52 (12) ◽  
pp. 1182-1190 ◽  
Author(s):  
Amanda Labrado ◽  
Terry L. Pavlis ◽  
Jeffrey M. Amato ◽  
Erik M. Day
Keyword(s):  
Early Cretaceous ◽  
Detrital Zircon ◽  
Early Jurassic ◽  
Ductile Deformation ◽  
Metamorphic Rocks ◽  
Accretionary Complex ◽  
Metamorphic Complex ◽  
Metasedimentary Rocks ◽  
South Central ◽  
Detrital Zircon Ages

A complex array of faulted arc rocks and variably metamorphosed forearc accretionary complex rocks form a mappable arc–forearc boundary in southern Alaska known as the Border Ranges fault (BRF). We use detrital U–Pb zircon dating of metasedimentary rocks within the Knik River terrane in the western Chugach Mountains to show that a belt of Early Cretaceous amphibolite-facies metamorphic rocks along the BRF was formed when older mélange rocks of the Chugach accretionary complex were reworked in a sinistral-oblique thrust reactivation of the BRF during a period of forearc plutonism. The metamorphic subterrane of the Knik River terrane has a maximum depositional age (MDA) of 156.5 ± 1.5 Ma and a detrital zircon age spectrum that is indistinguishable from the Potter Creek assemblage of the Chugach accretionary complex, supporting correlation of these units. These ages contrast strongly with new and existing data that show Triassic to earliest Jurassic detrital zircon ages from metamorphic screens in the plutonic subterrane of the Knik River terrane, a fragmented Early Jurassic plutonic assemblage generally interpreted as the basement of the Peninsular terrane. Based on these findings, we propose the following new terminology for the Knik River terrane: (1) “Carpenter Creek metamorphic complex” for the Early Cretaceous “metamorphic subterrane”, (2) “western Chugach trondhjemite suite” for the Early Cretaceous forearc plutons within the belt, (3) “Friday Creek assemblage” for a transitional mélange unit that contains blocks of the Carpenter Creek complex in a chert–argillite matrix, and (4) “Knik River metamorphic complex” in reference to metamorphic rocks engulfed by Early Jurassic plutons of the Peninsular terrane that represent the roots of the Talkeetna arc. The correlation of the Carpenter Creek metamorphic complex with the Chugach mélange indicates that the trace of the BRF lies ∼1–5 km north of the map trace shown on geologic maps, although, like other segments of the BRF, this boundary is blurred by local complexities within the BRF system. Ductile deformation of the mélange is sufficiently intense that few vestiges of its original mélange fabric exist, suggesting the scarcity of rocks described as mélange in the cores of many orogens may result from misidentification of rocks that have been intensely overprinted by younger, ductile deformation.

Style of fluid flow and deformation in and around an ancient out-of-sequence thrust: An example from the Nobeoka Tectonic Line in the Shimanto accretionary complex, Southwest Japan

Island Arc ◽  
2009 ◽  
Vol 18 (2) ◽  
pp. 333-351 ◽  
Author(s):  
Hideki Mukoyoshi ◽  
Tetsuro Hirono ◽  
Hidetoshi Hara ◽  
Kotaro Sekine ◽  
Noriyoshi Tsuchiya ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Accretionary Complex ◽  
Southwest Japan ◽  
Tectonic Line

Early Cretaceous wedge extrusion in the Indo-Burma Range accretionary complex: implications for the Mesozoic subduction of Neotethys in SE Asia

2017 ◽  
Vol 106 (4) ◽  
pp. 1391-1408 ◽  
Author(s):  
Ji’en Zhang ◽  
Wenjiao Xiao ◽  
Brian F. Windley ◽  
Fulong Cai ◽  
Kyaing Sein ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Accretionary Complex ◽  
Se Asia

Structure and tectonic evolution of the Late Jurassic–Early Cretaceous Wandashan accretionary complex, NE China

2018 ◽  
Vol 61 (1) ◽  
pp. 17-38 ◽  
Author(s):  
Han Zheng ◽  
Xiaomeng Sun ◽  
Kuo Wan ◽  
Pujun Wang ◽  
Song He ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Tectonic Evolution ◽  
Late Jurassic ◽  
Accretionary Complex ◽  
Ne China
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