Detrital Zircon U-Pb Geochronology and Its Provenance Implications on Silurian Tarim Basin
0
Citation
0
Reference
20
Related Paper
Abstract:
作为在 Tarim 盆的海洋的沉积物的主要探索目标之一，志留纪从油 / 气体探索和地质学家被付了更多的注意。然而，由于广泛地沉积物和以后的侵蚀，恢复原来的盆是困难的。包围志留纪 Tarim 盆的构造活动和起源系统有很多争吵。标明日期从很好 Tabei 钻获得的数据的由岩屑形成的锆石 U-Pb 的帮助() 并且 Tazhong () 区域和 Sishichang () 并且 Xiangyangcun () 露头侧面，与另外的地质、地球物理的数据， tectothermal 进化和起源综合志留纪沉积物的自然被揭示了。标明日期表演 Tarim 盆的锆石 U-Pb 经历了 56 个重要 tectothermal 事件：3 5003 000 妈 Paleo-Mesoarchean 在 2 500 和 1 800 妈 Paleoproterozoic 附近，约 1 000 和 800 妈 Neoproterozoic，和 500400 妈 Eopaleozoic tectothermal 事件。这些 tectothermal 事件反映了 Tarim microplates 的进化，分别地， Tarim 盆对应于形成和 Ur supercontinent， Kenorland，哥伦比亚和 Rodinia supercontinent 的 spilitting 过程。Tazhong 和 Tabei 区域的样品之间的差别显示诺思和南方 Tarim microplates 在 Paleo-Mesoarchean 是不同的，并且以后的进化在 Paleoproterozoic 以后是更同步的。与地震数据和露头解释综合，标明日期结果的 U-Pb 也表明包围构造活动在志留纪期间仍然是很活跃的，并且显示不同区域有不同来源系统。在 Tadong () 并且 Manjiaer () 消沉，主要来源系统来自奥陶纪 Altyn orogenic 带。在 Tabei 区域和 Tarim 盆的西北，主要来源系统来自再循环 orogenic 地区(南方 Tianshan 的活动() 山) 并且前寒武纪的稳定的地下室(在 Tabei 的北方的本地 paleo 高举) 。奥陶纪高举并且在 Tarim 盆和前寒武纪的花岗石地下室的南方的 orogenic 地区提供了大量来源系统给 Tazhong 区域。Keywords:
Tarim basin
Supercontinent
Rodinia
Cite
The analysis of Silurian sedimentary provenances plays an important role in the evolution of the Silurian in the Tarim basin and the surrounding orogenic belts in which it is the first widespread sandstone cap rock in the Tarim basin. The U-Pb isotopic age of zircons from 2 clastic rocks in the northern Tarim basin was obtained in situ by LA-ICP-MS,it indicates that there are three groups sedimentary source ages for the Silurian:1500-1600 Ma of the early Mesoproterozoic,750-900 Ma of early Neoproterozoic,450-500 Ma of Ordovician. The zircon 207Pb/235U-206Pb/238U concordant ages were 447±65 Ma,760±6 Ma,1600±20 Ma respectively for the western and 474±50 Ma,885±1 Ma,1556±290 Ma for the eastern area in the northern Tarim basin. There are obvious different provenance regions and provenance ages for the Silurian between the eastern and western areas. Based on the data of detrital zircon ages and regional geology,the Ordovician igneous rocks in Altun Tagh were the main source of the Silurian in eastern area,and the Precambrian basement of the northern paleo-uplifts is the main provenance of the Silurian in western area. It is indicated that there is a large scale intraplate extension and magmatism in Nanhuan Period,and the Tarim plate had the same convergent and breakup history as the Rodinia supercontinent in the Neoproterozoic. It also demonstrated that the north Tarim continent maybe has the same tectonic event as the breakup of Columbia supercontinent,but not the same as the southern Tarim continent in the early Mesoproterozoic. This result has yielded a new intraplate age evidence to study the Precambrian evolution of the Tarim plate.
Supercontinent
Rodinia
Laurentia
Large igneous province
Cite
Citations (11)
Geochronology
Rodinia
Cite
Citations (57)
We undertook an integrated approach incorporating whole‐rock geochemistry and detrital zircon U‐Pb geochronology from Permian sedimentary rocks in the Solonker area of central Inner Mongolia, China with the aim of constraining the tectonic evolution of the eastern segment of the Central Asian Orogenic Belt. Geochemical analysis reveals a close relationship between the sedimentary and volcanic rock suites in the study region. Detrital zircons from seven samples collected from the Zhesi Formation yield U‐Pb ages that cluster around 309–275 Ma and 464–435 Ma, with two main age peaks of ~452 and ~288 Ma. However, additional detrital zircons with ages in the range of 2,634–543 Ma are sparse and with no obvious age peaks. The results suggest that the deposition of the Zhesi Formation occurred from the Middle to the Late Permian and from two major age provenances: the Precambrian basement of the North China Plate (~1,880 Ma and ~2,520 Ma) and the Paleozoic Southern orogenic belt along the northern margin of North China (~288 Ma and ~452 Ma). In this contribution, we suggest that the Zhesi Formation in the Solonker area formed in response to the Early to Middle Permian subduction tectonic setting of the Paleo‐Asian Ocean (PAO), probably formed in a forearc basin and that the final closure of the PAO occurred after the Late Permian.
Geochronology
Basement
Forearc
Cite
Citations (2)
Cite
Citations (137)
Neoproterozoic glaciations of Quruqtagh area in Tarim basin are recognized,four of which appear to be global and with different volcanic rocks.In recent years,Snow earth hypothesis put forwards to the study of glaciation,any advancement of sedimentary,depositional environment and glaciation chronostratigraphic dating for the four glaciations in Quruqtagh area in Tarim basin,which will put more attention to global.This paper gives a new zircon SHRIMP U-Pb dating to be showing an evidence for the Neoproterozoic glaciations of Quruqtagh area in Tarim basin.
Diamictite
Tarim basin
Snowball Earth
Cite
Citations (26)
The Permian sedimentary rocks in the Turpan–Hami Basin are key records of the tectonic evolution in the Eastern Tianshan area, although their depositional ages and provenances remain relatively less studied. Here, we conducted detrital zircon U–Pb geochronology on subsurface samples collected from Well LN1 in the Turpan–Hami Basin to understand the depositional ages and provenances of the Permian rocks. In this study, detrital zircon U–Pb ages from the Late Carboniferous Sumuke Formation yielded a notable Permian age population with the youngest single‐grain age at 282.6 Ma. Compiling this result with a published dataset from the surrounding regions of the Turpan–Hami Basin, it shows that the Sumuke Formation was actually deposited in the Early Permian and the Late Carboniferous palynological assemblages within it are of recycled origin. The detrital zircon age spectra of the three Early–Middle Permian samples from Well LN1 define similar unimodal distribution, with prominent late Carboniferous age peaks and scarce Precambrian ages, further indicating that the zircon grains in these three samples should be ultimately sourced from the Jueluotag, the southern branch of the North Tianshan. Regionally, the Bogda, the northern branch of the North Tianshan, as catchment areas recorded interaction between southern and northern sources, and thus, there was a single greater Junggar–Turpan Basin during the Early–Middle Permian. During the latest Middle Permian to Late Permian, provenance shifts occurred at the Jueluotag and the southern piedmont of the Bogda, reflecting the uplift of the Central Tianshan and the Bogda and the isolation of the Junggar Basin and Turpan–Hami Basin. Integrating regional geological studies and provenance evolution trends, we suggest that the Turpan–Hami Basin and its surrounding regions were in a rift setting controlled by post‐collision extension during Early–Middle Permian. By contrast, tectonic contraction and inversion occurred during the latest Middle Permian to Late Permian as a part of the intraplate orogenic process in the Tianshan, which responded to the convergence between the Songpan–Ganzi terrane and palaeo‐Eurasian Plate.
Geochronology
Cite
Citations (16)
The Ulugqat Basin is located at the juncture of the Tarim Basin, the western Tianshan Orogen of the Central Asian Orogenic Belt, and the Pamir salient of the Tethys domain. A comprehensive provenance study using sedimentology, petrology, and detrital zircon U–Pb geochronology was carried out on the clastic rocks of the fifth member of the Lower Cretaceous Kezilesu Group from the Ulugqat Basin, aiming to better understand the nature of its relationships with the neighbouring tectonic units as well as the formation of sandstone‐hosted Zn–Pb mineralization. The fifth member consists of conglomerate, gravelly sandstone, sandstone, and mudstone interbeds, and is interpreted as alluvial fan–braid river–braid river delta sediments. The conglomerate and gravelly sandstone contain different kinds of lithic fragments, including phyllite, quartzite, chert, chalcedony, and some felsic igneous rocks, with low compositional maturities. The detrital zircon U–Pb ages of sandstone from the uppermost part of the fifth member range widely from 229.7 to 2,984.9 Ma, concentratedly distributed in five groups: 230–300, 390–480, 750–880, 1,600–2,200, and 2,300–3,000 Ma. The identified palaeocurrent directions, heavy mineral assemblages, specific provenance indicators, and distributions of detrital zircon U–Pb ages all indicate that these clastic rocks are probably sourced from the South Tianshan Orogen to the north, rather than the Pamir salient, probably involving the Proterozoic Aksu metamorphic rocks, Palaeozoic sedimentary rocks, Late Carboniferous–Early Permian alkali granite, and some mafic/ultramafic rocks of ophiolitic mélange. This interpretation is consistent with a late Early Cretaceous uplifting of the South Tianshan Orogen according to previous low‐temperature thermochronological data sets. The thick deposition of these Lower Cretaceous clastic rocks and associated uplifting of the South Tianshan Orogen are interpreted to be related to the coeval collision of the Karakoram–Lhasa Block with the southern Asian margin.
Conglomerate
Felsic
Cite
Citations (5)
Geochronology
Rodinia
Supercontinent
Laurentia
Cite
Citations (10)
Geochronology
Outcrop
Cite
Citations (77)
Rodinia
Geochronology
Supercontinent
Cite
Citations (29)