Survived Seamount Reveals an in situ Origin for the Central Qiangtang Metamorphic Belt in the Tibetan Plateau

Liu, Deliang; Shi, Ruiping; Ding, Lin; Jiang, Shao‐Yong

doi:10.1007/s12583-019-1250-9

Cited by 4 publications

(3 citation statements)

References 52 publications

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“…(12) The focus of Liu et al (2019) is on Late Triassic volcanic rocks of the central Qiangtang metamorphic belt (CQMB). The locality is about 10 km south of the Chabo Lake, close to the southern margin of the CQMB.…”

Section: Metamorphism and Orogenic Belts-contributions To This Speciamentioning

confidence: 99%

Preface: Metamorphism and Orogenic Belts—Response from Micro- to Macro-Scale

Schertl

Reinhardt

2019

J. Earth Sci.

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The geological toolbox for the analysis of orogenic processes has seen substantial additions over the recent decades. Major advances have been made in the ability to simulate geological conditions and processes by computer modeling, we have a much improved knowledge of geochemical processes (trace elements and isotopes in particular), and, last but not least, the range and versatility of micro-analytical methods and instrumentation available to us has been expanded dramatically. The latter aspect has had a particular impact on metamorphic petrology as the conventional tools to determine pressure-temperaturetime paths via rock and mineral analysis combined with isotope geochronology have generally gained in precision and accuracy through a much improved resolution. Geochronology has moved from whole-grain analysis to spot analyses on zoned single grains while analyzing trace elements and isotopes at the same time. It is therefore possible to recognize complex multi-stage orogenic events in single samples or single grains. Diffusion profiles in minerals provide us with timescales of metamorphic and magmatic processes. Major and trace elements as well as isotope profiles of mineral grains give us insight into changing ambient conditions during mineral growth. This special issue focuses on pressure-temperature conditions and geochronology of metamorphic rocks, isotope studies of magmatic rocks, partial melting and metasomatic processes, all with a view at tectonic implications and orogeny. Much of the evidence has been gained from small-scale observation and analysis. Diligent field work and detailed microscopic examination remain indispensable, though, as demonstrated clearly by the "expansion" of the P-T space as applicable to crustal metamorphic processes towards extreme pressures and temperatures. As a consequence, much interest has thus focused on UHP and UHT rocks and the orogenic processes that generate them. There is petrological evidence for subduction to, and subsequent exhumation from, depths in excess of 250 km. While this impacts substantially on the large-scale geodynamic models of orogenic processes, the evidence is gathered primarily from small-scale petrological observation. The same applies in principle to UHT granulites. To generate temperatures in the 900 to 1 100 C range within the sillimanite stability field in orogenic heat budget models remains a serious challenge, however. The large overlap of solid-state metamorphism, partial anatexis and magmatic crystallization in P-T space suggests close interrelationships, and the role and contribution of the diverse magmatic activities in forming orogenic belts, from the onset of subduction to late-orogenic delamination or slab-break-off is crucial for our understanding of geodynamics, with focus on geochemistry and geochronology. Aspects of metasomatism in the framework of orogeny are given some special consideration in this issue. The topics include the formation of sagvandite, pyrope quartzite (or whiteschist), jadeitite and rodingite. One of the ke...

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Section: Metamorphism and Orogenic Belts-contributions To This Speciamentioning

confidence: 99%

Preface: Metamorphism and Orogenic Belts—Response from Micro- to Macro-Scale

Schertl

Reinhardt

2019

J. Earth Sci.

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“…Proposed “Paleo‐Tethys” sutures include the East Kunlun‐Animaqing suture (EKAS) that broadly demarcates the southern margin of Tarim and Qaidam, the Xijinwulan‐Jinshajiang suture (XJS) that forms the northern border of the North Qiangtang block (NQB) and the Longmuco‐Shuanghu suture (LSS), which separates the NQB and South Qiangtang block (SQB), (e.g., Chang & Zheng, 1973; Kapp et al., 2000, 2003; Li, 1987; Liu et al., 2019; Li, Zhai, Dong, Zeng, & Huang, 2007; Metcalfe, 2013; Pan et al., 2004; Pullen et al., 2008; Yin & Harrison, 2000) (Figure 1a). These various sutures may represent different “branches” of the Paleo‐Tethys, which should thus be treated as an oceanic realm rather than a singular basin.…”

Section: Introductionmentioning

confidence: 99%

Paleomagnetism of Late Triassic Volcanic Rocks From the South Qiangtang Block, Tibet: Constraints on Longmuco‐Shuanghu Ocean Closure in the Paleo‐Tethys Realm

Wei,

Cheng,

Domeier

et al. 2023

Geophysical Research Letters

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The South Qiangtang block of the Qinghai‐Tibet Plateau represents an area critical to understanding the late Paleozoic and early Mesozoic history of the Tethyan realm, but its drift history remains poorly constrained. Here we report a new quantitative paleogeographic constraint for the South Qiangtang block from a paleomagnetic study of Late Triassic volcanic rocks of the Xiaoqiebao Formation. A characteristic remanent magnetization isolated from 25 sites passes both fold‐ and reversal tests, and likely represents a primary magnetization. On the basis of these data, we estimate that the South Qiangtang block occupied a paleolatitude of 30.1 ± 4.6°N at ca. 222 Ma. When combined with existing paleomagnetic constraints, these new results indicate that the South Qiangtang block (and other “Cimmerian” blocks) moved rapidly northward (in true latitude) between the middle Permian and Late Triassic. Our new data further suggest that the southern branch of the Paleo‐Tethys (Longmuco‐Shuanghu Ocean) likely closed by the mid‐Late Triassic.

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“…Simple models of Tethyan evolution have treated the Qiangtang block as a unified block that rifted from northern Gondwana and drifted northward in concert with the rest of the Cimmerian constituents. However, geological investigations have increasingly suggested the Qiangtang block to be a complex of two continental blocks that were independent until early Mesozoic time: a North Qiangtang block (NQB) and a South Qiangtang block (SQB), separated by a Triassic suture (the Longmu Co‐Shuanghu Suture Zone; LSS) (e.g., Li, 1987; Liu et al., 2019; Tang & Zhang, 2014; Zhai et al., 2011; Zhang, Cai, et al., 2006; Zhang, Zhang, et al., 2006; Zhang et al., 2016). This potential late Paleozoic independence of the NQB and SQB has important implications for the structure and kinematic evolution of Tethyan realm more broadly, because it implies that the constituents of the Qinghai‐Tibet Plateau do not represent a single ‘wave’ of continental blocks from northern Gondwana.…”

Section: Introductionmentioning

confidence: 99%

Placing Another Piece of the Tethyan Puzzle: The First Paleozoic Paleomagnetic Data From the South Qiangtang Block and Its Paleogeographic Implications

et al. 2022

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The Qinghai-Tibet Plateau comprises a mosaic of geologically distinct Paleozoic and Mesozoic blocks, including the Qaidam block, Songpan-Ganzi block, Qiangtang block(s), Lhasa block and Himalayan block (Figure 1a). It is generally acknowledged that some of these blocks originated from the northern margin of Gondwana, splitting from it in the Carboniferous or Permian before subsequently drifting northward to collide with Laurasia in the

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Survived Seamount Reveals an in situ Origin for the Central Qiangtang Metamorphic Belt in the Tibetan Plateau

Cited by 4 publications

References 52 publications

Preface: Metamorphism and Orogenic Belts—Response from Micro- to Macro-Scale

Preface: Metamorphism and Orogenic Belts—Response from Micro- to Macro-Scale

Paleomagnetism of Late Triassic Volcanic Rocks From the South Qiangtang Block, Tibet: Constraints on Longmuco‐Shuanghu Ocean Closure in the Paleo‐Tethys Realm

Placing Another Piece of the Tethyan Puzzle: The First Paleozoic Paleomagnetic Data From the South Qiangtang Block and Its Paleogeographic Implications

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