Geochemistry and petrogenesis of the Late Cretaceous Haji-Abad ophiolite (Outer Zagros Ophiolite Belt, Iran): implications for geodynamics of the Bitlis-Zagros suture zone

2012 ◽  
Vol 48 (6) ◽  
pp. 579-602 ◽  
Author(s):  
H. Shafaii Moghadam ◽  
H. Mosaddegh ◽  
M. Santosh
Keyword(s):  
Late Cretaceous ◽  
Suture Zone ◽  
Ophiolite Belt

Reworking of juvenile crust beneath the Bangong–Nujiang suture zone: Evidence from Late Cretaceous granite porphyries in Southern Qiangtang, Central Tibet

Lithos ◽  
2021 ◽  
pp. 106097
Author(s):  
Zi-Long Wang ◽  
Jing-Jing Fan ◽  
Qiang Wang ◽  
Wan-Long Hu ◽  
Zong-Yong Yang ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Suture Zone ◽  
Juvenile Crust ◽  
Granite Porphyries ◽  
Central Tibet

scholarly journals Crustal architecture of a metallogenic belt and ophiolite belt: implications for mineral genesis and emplacement from 3-D electrical resistivity models (Bayankhongor area, Mongolia)

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Matthew J. Comeau ◽  
Michael Becken ◽  
Alexey V. Kuvshinov ◽  
Sodnomsambuu Demberel
Keyword(s):  
Electrical Resistivity ◽  
Crustal Structure ◽  
Three Dimensional ◽  
Suture Zone ◽  
Fault System ◽  
Magnetotelluric Data ◽  
Low Resistivity ◽  
Ophiolite Belt ◽  
Geological Processes ◽  
Metallogenic Belt

AbstractCrustal architecture strongly influences the development and emplacement of mineral zones. In this study, we image the crustal structure beneath a metallogenic belt and its surroundings in the Bayankhongor area of central Mongolia. In this region, an ophiolite belt marks the location of an ancient suture zone, which is presently associated with a reactivated fault system. Nearby, metamorphic and volcanic belts host important mineralization zones and constitute a significant metallogenic belt that includes sources of copper and gold. However, the crustal structure of these features, and their relationships, are poorly studied. We analyze magnetotelluric data acquired across this region and generate three-dimensional electrical resistivity models of the crustal structure, which is found to be locally highly heterogeneous. Because the upper crust (< 25 km) is found to be generally highly resistive (> 1000 Ωm), low-resistivity (< 50 Ωm) features are conspicuous. Anomalous low-resistivity zones are congruent with the suture zone, and ophiolite belt, which is revealed to be a major crustal-scale feature. Furthermore, broadening low-resistivity zones located down-dip from the suture zone suggest that the narrow deformation zone observed at the surface transforms to a wide area in the deeper crust. Other low-resistivity anomalies are spatially associated with the surface expressions of known mineralization zones; thus, their links to deeper crustal structures are imaged. Considering the available evidence, we determine that, in both cases, the low resistivity can be explained by hydrothermal alteration along fossil fluid pathways. This illustrates the pivotal role that crustal fluids play in diverse geological processes, and highlights their inherent link in a unified system, which has implications for models of mineral genesis and emplacement. The results demonstrate that the crustal architecture—including the major crustal boundary—acts as a first‐order control on the location of the metallogenic belt.

The development of a late Cretaceous microplate suture zone in SW Cyprus

1993 ◽  
Vol 76 (1) ◽  
pp. 177-195 ◽  
Author(s):  
J. Malpas ◽  
T. Calon ◽  
G. Squires
Keyword(s):  
Late Cretaceous ◽  
Suture Zone

Paleomagnetic study of the Late Cretaceous red beds in the eastern segement of the Bangong-Nujiang suture zone and its tectonic implications

2020 ◽  
Vol 36 (10) ◽  
pp. 3243-3255
Author(s):  
CAO Yong ◽  
◽  
SUN ZhiMing ◽  
LI HaiBing ◽  
CAO XinWen ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Suture Zone ◽  
Red Beds ◽  
Tectonic Implications ◽  
Paleomagnetic Study

scholarly journals Spatial evolution of Zagros collision zone in Kurdistan, NW Iran: constraints on Arabia–Eurasia oblique convergence

Solid Earth ◽  
2016 ◽  
Vol 7 (2) ◽  
pp. 659-672 ◽  
Author(s):  
Shahriar Sadeghi ◽  
Ali Yassaghi
Keyword(s):  
Late Cretaceous ◽  
Strike Slip ◽  
Suture Zone ◽  
Fault System ◽  
Spatial Evolution ◽  
Nw Iran ◽  
Collision Zone ◽  
Deformation Partitioning ◽  
Oblique Convergence ◽  
External Part

Abstract. Stratigraphy, detailed structural mapping and a crustal-scale cross section across the NW Zagros collision zone provide constraints on the spatial evolution of oblique convergence of the Arabian and Eurasian plates since the Late Cretaceous. The Zagros collision zone in NW Iran consists of the internal Sanandaj–Sirjan, Gaveh Rud and Ophiolite zones and the external Bisotoun, Radiolarite and High Zagros zones. The Main Zagros Thrust is the major structure of the Zagros suture zone. Two stages of oblique deformation are recognized in the external part of the NW Zagros in Iran. In the early stage, coexisting dextral strike-slip and reverse dominated domains in the Radiolarite zone developed in response to deformation partitioning due to oblique convergence. Dextral-reverse faults in the Bisotoun zone are also compatible with oblique convergence. In the late stage, deformation partitioning occurred during southeastward propagation of the Zagros orogeny towards its foreland resulting in synchronous development of orogen-parallel strike-slip and thrust faults. It is proposed that the first stage was related to Late Cretaceous oblique obduction, while the second stage resulted from Cenozoic collision. The Cenozoic orogen-parallel strike-slip component of Zagros oblique convergence is not confined to the Zagros suture zone (Main Recent Fault) but also occurred in the external part (Marekhil–Ravansar fault system). Thus, it is proposed that oblique convergence of Arabian and Eurasian plates in Zagros collision zone initiated with oblique obduction in the Late Cretaceous followed by oblique collision in the late Tertiary, consistent with global plate reconstructions.

scholarly journals Recognition of Late Cretaceous Hasanbag ophiolite-arc rocks in the Kurdistan Region of the Iraqi Zagros suture zone: A missing link in the paleogeography of the closing Neotethys Ocean

Lithosphere ◽  
2012 ◽  
Vol 4 (5) ◽  
pp. 395-410 ◽  
Author(s):  
S.A. Ali ◽  
S. Buckman ◽  
K.J. Aswad ◽  
B.G. Jones ◽  
S.A. Ismail ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Suture Zone ◽  
Kurdistan Region ◽  
Missing Link ◽  
Neotethys Ocean

Closure of the Bangong–Nujiang Tethyan Ocean in the central Tibet: Results from the provenance of the Duoni Formation

2019 ◽  
Vol 89 (10) ◽  
pp. 1039-1054 ◽  
Author(s):  
Zhicai Zhu ◽  
Qingguo Zhai ◽  
Peiyuan Hu ◽  
Sunlin Chung ◽  
Yue Tang ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Late Cretaceous ◽  
Suture Zone ◽  
The Tibetan Plateau ◽  
Tectonic History ◽  
Magmatic Rocks ◽  
Two Samples ◽  
Delta Sequence ◽  
History Of ◽  
Central Tibet

ABSTRACT The closure of the Bangong–Nujiang Tethyan Ocean (BNTO) and consequent Lhasa–Qiangtang collision is vital to reasonably understanding the early tectonic history of the Tibetan Plateau before the India-Eurasia collision. The timing of the Lhasa–Qiangtang collision was mainly constrained by the ophiolite and magmatic rocks in previous studies, with only limited constraints from the sedimentary rocks within and adjacent to the Bangong–Nujiang suture zone. In the middle segment of the Bangong–Nujiang suture zone, the Duoni Formation, consisting of a fluvial delta sequence with minor andesite interlayers, was originally defined as the Late Cretaceous Jingzhushan Formation and interpreted as the products of the Lhasa–Qiangtang collision during the Late Cretaceous. Our new zircon U-Pb data from two samples of andesite interlayers demonstrate that it was deposited during the latest Early Cretaceous (ca. 113 Ma) rather than Late Cretaceous. Systemic studies on the sandstone detrital model, heavy-mineral assemblage, and clasts of conglomerate demonstrate a mixed source of both Lhasa and Qiangtang terranes and ophiolite complex. Clasts of conglomerate contain abundant angular peridotite, gabbro, basalt, chert, andesite, and granite, and minor quartzite and gneiss clasts also exist. Sandstones of the Duoni Formation are dominated by feldspathic–lithic graywacke (Qt25F14L61 and Qm13F14L73), indicative of a mixture of continental-arc and recycled-orogen source origin. Detrital minerals of chromite, clinopyroxene, epidote, and hornblende in sandstone also indicate an origin of ultramafic and mafic rocks, while garnets indicate a metamorphosed source. Paleocurrent data demonstrate bidirectional (southward and northward) source origins. Thus, we suggest that the deposition of the Duoni Formation took place in the processes of the Lhasa–Qiangtang collision during the latest Early Cretaceous (∼ 113 Ma), and the BNTO had been closed by this time.

The Late Cretaceous A-type alkali-feldspar granite from Mt. Požeška Gora (N Croatia): Potential marker of fast magma ascent in the Europe–Adria suture zone

2020 ◽  
Vol 71 (4) ◽  
Author(s):  
Dražen Balen ◽  
Petra Schneider ◽  
HANS-JOACHIM Massonne ◽  
Joachim Opitz ◽  
Jarmila Luptáková ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Alkali Feldspar ◽  
Suture Zone ◽  
Magma Ascent ◽  
Potential Marker

scholarly journals Melt evolution of upper mantle peridotites and mafic dikes in the northern ophiolite belt of the western Yarlung Zangbo suture zone (southern Tibet)

Lithosphere ◽  
2018 ◽  
Vol 10 (1) ◽  
pp. 109-132 ◽  
Author(s):  
Fei Liu ◽  
Yildirim Dilek ◽  
Yanxue Xie ◽  
Jingsui Yang ◽  
Dongyang Lian
Keyword(s):  
Upper Mantle ◽  
Suture Zone ◽  
Southern Tibet ◽  
Ophiolite Belt ◽  
Mantle Peridotites ◽  
Melt Evolution ◽  
Yarlung Zangbo Suture Zone

scholarly journals Late Cretaceous calc-alkaline and adakitic magmatism in the Sistan suture zone (Eastern Iran): Implications for subduction polarity and regional tectonics

2020 ◽  
Vol 204 ◽  
pp. 104588
Author(s):  
Michael Jentzer ◽  
Hubert Whitechurch ◽  
Philippe Agard ◽  
Marc Ulrich ◽  
Benoit Caron ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Suture Zone ◽  
Calc Alkaline ◽  
Eastern Iran ◽  
Regional Tectonics
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