Tracking deep crust by zircon xenocrysts within igneous rocks from the northern Alxa, China: Constraints on the southern boundary of the Central Asian Orogenic Belt

Zhang, Jianjun; Wang, Tao; Zhang, Lei; Tong, Ying; Zhang, Zhaochong; Shi, Xuhua; Guo, Lei; Huang, He; Yang, Qiang; Huang, Wei; Zhao, Jianxin; Yao, Ke; Hou, Jiyao

doi:10.1016/j.jseaes.2015.04.019

Cited by 69 publications

(23 citation statements)

References 142 publications

(182 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Comparison of the age distributions of the Permian volcanic‐sedimentary rocks from the southwestern Alxa (a) with magmatic records of the Alxa Tectonic Belt (b), southern Beishan Orogenic Belt (c), and southern Mongolia (d). Age sources for Alxa magmatic rocks (b) are from Dan, Li, Wang, Tang, et al (), Feng et al (), Liu et al (), Q. Liu, Zhao, Han, Eizenhofer, Zhu, Hou, and Zhang (), Q. Liu, Zhao, Han, Eizenhofer, Zhu, Hou, Zhang, and Wang (), Ran et al (), X. J. Shi et al (), G. Z. Shi et al (), W. Zhang et al (), J. J. Zhang, Wang, et al (), Zhang et al (), Zheng et al (), and Zhou et al (). Age sources for southern Beishan (c) are from Song et al () and W. Zhang et al ().…”

Section: Discussionmentioning

confidence: 99%

“…However, Shi et al () suggests that the Permian volcanic‐sedimentary rocks in the ATB was formed in an incipient continental rift setting after the final closure of the PAO and before the Middle Devonian. Moreover, there is still little consensus on the location of the southernmost CAOB and the boundary between the subduction‐dominated CAOB and the pericratonic basement in the Alxa area (J. J. Zhang, Wang, et al, ). These on‐going debates call for more detailed investigation and an extensive study of the Permian tectonic processes across the ATB.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Final Subduction Processes of the Paleo‐Asian Ocean in the Alxa Tectonic Belt (NW China): Constraints From Field and Chronological Data of Permian Arc‐Related Volcano‐Sedimentary Rocks

et al. 2018

View full text Add to dashboard Cite

The timing of final subduction and closure of the Paleo-Asian Ocean (PAO) is controversial.Located in a key position within the southern Central Asian Orogenic Belt, the Alxa Tectonic Belt (ATB) provides a crucial window to evaluate the final subduction processes of the PAO. This study presents field and geochronological data for Permian volcano-sedimentary rocks from the southwestern ATB. Field observations revealed a syntectonic unconformity between the Middle and Upper Permian strata. Detrital zircon U-Pb analyses show a major peak at~273 Ma and a subordinate peak at~440 Ma for the Middle Permian sample. The Upper Permian samples show consistently unimodal age spectra with single peaks at 261 and~263 Ma, respectively. The Permian zircons from the analyzed samples yield predominately positive ε Hf (t) values, indicating major juvenile magmatic processes mixed with limited recycled Precambrian basement. The diagnostic zircon U-Pb-Hf isotopic characteristics and ubiquitous intermediate and felsic volcanic detritus in these rocks indicate rapid sediments accumulation sourced from a proximal magmatic terrane in a suprasubduction zone environment. The Paleozoic zircon U-Pb age peaks from this study are comparable to those for the Permian arc-related sediments along the Solonker Suture Zone, thus linking the Alxa active margin with the northern margin of the North China Craton during Middle-Late Permian times. Our study thus provides key constraints for the final subduction processes of the PAO, documented within the ATB, before the terminal amalgamation of the southern Central Asian Orogenic Belt.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Final Subduction Processes of the Paleo‐Asian Ocean in the Alxa Tectonic Belt (NW China): Constraints From Field and Chronological Data of Permian Arc‐Related Volcano‐Sedimentary Rocks

et al. 2018

View full text Add to dashboard Cite

show abstract

“…This indicates that the granitoids in the two belts have different sources: the source for the north belt granitoids is generally juvenile and the source for the south belt granitoids consists of more old materials. Therefore, the north belt could not be a part of the Alxa block [Shi et al, 2014a[Shi et al, , 2014bZhang et al, 2015].…”

mentioning

confidence: 99%

Late Paleozoic subduction system in the northern margin of the Alxa block, Altaids: Geochronological and geochemical evidences from ophiolites

et al. 2014

View full text Add to dashboard Cite

“…4a and 4c). Considering that the measuring points were on oscillatory zonings, the U-Pb ages should represent the crystalline age of zircons, and that the asymmetric distribution is caused by the captured zircons (Zhang et al, 2015;Du et al, 2017). The youngest group age of late Silurian gives a weighted mean age of 425 ± 4 Ma (MSWD = 0.04, n = 16), which is interpreted as the timing of the rhyodacite eruption, whereas the remaining older ages reflect that continuous and multiple magmatic activities occurred in the study area from the early Ordovician to middle Silurian.…”

Section: Zircon U-pb Geochronologymentioning

confidence: 99%

U–Pb ages and Hf isotopic composition of zircons and whole rock geochemistry of volcanic rocks from the Fangniugou area: Implications for early–middle Paleozoic tectonic evolution in Jilin Province, NE China

Han

Song

Han

et al. 2018

Journal of Mineralogical and Petrological Sciences

View full text Add to dashboard Cite

The Changchun-Yanji suture in Jilin Province, NE China is generally interpreted to mark the closure position of the Paleo-Asian Ocean along the north margin of the North China Craton. However, the issue about the earlymiddle Paleozoic tectonic evolution in this region has long been debated. In order to provide evidence for resolving this issue, we carried out a geochemical and zircon U-Pb-Hf study on the Fangniugou and Taoshan volcanic rocks from the Fangniugou area of Jilin Province, in the Changchun-Yanji suture zone. Laser ablationinductively coupled plasma-mass spectrometry (LA-ICP-MS) zircon U-Pb dating indicates that the Fangniugou volcanic rocks are products of at least two volcanic events (~425 and 390 Ma) and that episodes of magmatism existed in Jilin Province during the early-middle Paleozoic period. These rocks, in conjunction with relevant data from the literature, indicate that early-middle Paleozoic magmatism occurred along the Changchun-Yanji suture. The volcanic rocks belong to medium-to high-K calc-alkaline series and display features of I-type granites of subduction-related igneous rocks. During the late Silurian-middle Devonian, the Y and Yb concentrations progressively decreased with time, accompanied by an increase in K 2 O concentrations and (La/Yb) N values, indicating a process of crustal thickening. This interpretation is supported by the presence of early Paleozoic arc igneous rocks and the formation of early Devonian molasse in central Jilin Province. Zircon grains separated from the rocks have high ε Hf (t) values and two-stage Hf model (T DM2 ) ages varying from +4.92-8.76 and 0.84-1.09 Ga, respectively. All these characteristics, in conjunction with trace element features, suggest that the late Silurian rocks were generated by partial melting of a depleted mafic lower crust in a subduction zone setting, whereas the middle Devonian rocks were derived from partial melting of a thickened lower crust the most probably related to a collisional event.

show abstract

Tracking deep crust by zircon xenocrysts within igneous rocks from the northern Alxa, China: Constraints on the southern boundary of the Central Asian Orogenic Belt

Cited by 69 publications

References 142 publications

Final Subduction Processes of the Paleo‐Asian Ocean in the Alxa Tectonic Belt (NW China): Constraints From Field and Chronological Data of Permian Arc‐Related Volcano‐Sedimentary Rocks

Final Subduction Processes of the Paleo‐Asian Ocean in the Alxa Tectonic Belt (NW China): Constraints From Field and Chronological Data of Permian Arc‐Related Volcano‐Sedimentary Rocks

Late Paleozoic subduction system in the northern margin of the Alxa block, Altaids: Geochronological and geochemical evidences from ophiolites

U–Pb ages and Hf isotopic composition of zircons and whole rock geochemistry of volcanic rocks from the Fangniugou area: Implications for early–middle Paleozoic tectonic evolution in Jilin Province, NE China

Contact Info

Product

Resources

About