Trace and rare earth element geochemistry of the Upper Triassic mudstones in the southern Ordos Basin, Central China

Qiu, Xinwei; Liu, Chiyang; Wang, Feifei; Deng, Yu; Mao, Guangzhou

doi:10.1002/gj.2542

Cited by 68 publications

(50 citation statements)

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“…The initial uplift of the western Qinling occurred due to the Middle-Late Triassic collision between the Yangtze and North China Cratons (e.g. Deng et al 2009;Qiu et al 2014;Zhang et al 2014b). It is possible that the Bailongjiang block could have blocked most of the turbiditic detritus from the North China Craton, the northern Qinling sub-belt, and the Qilian orogen into the main depositional basins in the Songpan-Ganzi area during Middle-Late Triassic times (Figure 12b-c; Zhang et al 2014b).…”

Section: Palaeographic Implicationsmentioning

confidence: 99%

Late Permian–Triassic siliciclastic provenance, palaeogeography, and crustal growth of the Songpan terrane, eastern Tibetan Plateau: evidence from U–Pb ages, trace elements, and Hf isotopes of detrital zircons

Zhang

Zeng

et al. 2015

International Geology Review

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In order to constrain the detrital provenance of the siliciclastic rocks, palaeogeographic variations, and crustal growth history of central China, we carried out simultaneously in situ U-Pb dating and trace element and Hf isotope analyses on 368 detrital zircons obtained from upper Permian-Triassic sandstones of the Songpan terrane, eastern Tibetan Plateau. Two groups of detrital zircons, i.e. magmatic and metamorphic in origin, have been identified based on cathodoluminescence images, zircon Ti-temperatures, and Th/U ratios. Our data suggest that the derivation of siliciclastic rocks in the Songpan terrane was mainly from the Qinling, Qilian, and Kunlun orogens, whereas the Yangtze and North China Cratons served as minor source areas during late Permian-Triassic times. The detrital zircons from Middle-Late Triassic siliciclastic rocks exhibit wide age spectra with two dominant populations of 230-600 Ma and >1600 Ma, peaking at~1.8-1.9 Ga and~2.4-2.5 Ga, suggestive of a derivation from the Qinling, Qilian, and Kunlun orogens and the Yangtze Craton being the minor source area. The proportions of detrital zircon populations from the northern Qinling, Qilian, and Kunlun orogens distinctly decreased during Middle-Late Triassic time, demonstrating that the initial uplift of the western Qinling occurred then and it could have blocked most of the detritus from the Qilian-northern Qinling orogens and North China Cratons into the main Songpan-Ganzi depositional basin. The relatively detrital zircon proportions of the Yangtze Craton source decreased during Early-Middle Late Triassic time, indicating that the Longmenshan orogen was probably being elevated, since the early Late Triassic and gradually formed a barrier between the Yangtze Craton and the Songpan terrane. In addition, our Lu-Hf isotopic results also reveal that the Phanerozoic magmatic rocks in central China had been the primary products of crustal reworking with insignificant formation of a juvenile crust.

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Section: Palaeographic Implicationsmentioning

confidence: 99%

Late Permian–Triassic siliciclastic provenance, palaeogeography, and crustal growth of the Songpan terrane, eastern Tibetan Plateau: evidence from U–Pb ages, trace elements, and Hf isotopes of detrital zircons

Zhang

Zeng

et al. 2015

International Geology Review

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“…These properties enable REE pattern to be a useful geochemical tracer (L.P. Zhang et al, ; Nakada et al, ). The REEs of crude oil samples that were determined are listed in Table , and the REE contents of the mudstones and oil shales in Yanchang Formation are also listed in Table for comparison (Qiu et al, , b). The content of REE in the crude oils is three orders of magnitude lower than that of the rock samples.…”

Section: Resultsmentioning

confidence: 99%

“…Note: The REE contents (ppm) of Chang 7 oil shales are from Qiu et al, . The REE contents (ppm) of Chang 7 and Chang 9 mudstones are from Qiu et al, .…”

Section: Resultsmentioning

confidence: 99%

“…Lower Jurassic Yanan Formation, unconformably overlying the Yanchang Formation, is also divided into ten subsections, namely, Yan 1 to Yan 10 from top to bottom (Duan, ), with the channel sandstone of Yan 10 and Yan 9 to be the most effective oil reservoirs (Song et al, ). Previous oil‐source correlation studies have suggested that the crude oils in the Ordos Basin were mainly derived from the Yanchang Formation (Zhang et al, ; Duan, ; Liu et al, ; Wang et al, ; Qiu et al, , b). In respect of specific hydrocarbon source, it is still debated.…”

Section: Introductionmentioning

confidence: 99%

“…The transition metals are particularly important in this regard (Oluwole et al, ). Geochemistry of source rock of Ordos Basin is relatively fairly documented in the literature (Qiu et al, , b). However, there is paucity of data on geochemistry of crude oils from Ordos Basin.…”

Section: Introductionmentioning

confidence: 99%

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Trace and rare earth element geochemistry of crude oils and their coexisting water from the Jiyuan Area of the Ordos Basin, N China

et al. 2017

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The concentration of trace and rare earth elements in 22 crude oil and five oilfield water samples, collected from Triassic Yanchang Formation and Jurassic Yanan Formation reservoirs in the Jiyuan Area of Ordos Basin, N China, was determined using inductively coupled plasma mass spectrometry (ICP-MS) for the first time. The oil samples were analysed to classify the oils into family and to determine the origin and depositional environment of organic matter that yield the oils using trace elements. The REE chondrite-normalized distribution patterns of the crude oils show light rare earth element (LREE) enrichment and right-oblique curves. These patterns could be divided into two distinct types that were consistent with that of the upper continental crust (UCC) and lower continental crust (LCC) characterizing by negative Eu anomalies and positive Eu anomalies, respectively. The REE concentrations in coexisting water samples are less than those in crude oils by a factor of ten. Cluster analysis also classified the oil samples from the Ordos Basin into two main groups. Integrated analysis of Co/Ni, V/Ni and V/ (V + Ni) values suggests that the organic matter have more terrigenous source input and the palaeoenvironment was anoxic and slightly oxic conditions. This study differs from previous studies by using trace element analyses of crude oils to constrain oil-source rock correlation. The results show that most of the crude oils in north Jiyuan area were derived from Chang 7 mudstones while those from Hongde area may be contributed by Chang 7 oil shales.

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An integrated petrographical and geochemical study of the Tredian Formation in the Salt and Trans‐Indus Surghar ranges, North‐West Pakistan: Implications for palaeoclimate

Qureshi,

Rizwan,

Janjuhah

et al. 2023

The Depositional Record

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The Middle Triassic Tredian Formation is well exposed in the western region of the Salt Range. It is mostly composed of sandstone with minor alternations of shales and dolomite. This is the first integrated attempt using petrographical and geochemical features to reveal palaeoclimate during deposition of the Tredian Formation. This work sheds light on the petrographical and geochemical properties of the Tredian sandstone in order to date various layers and evaluate the palaeoclimate. The formation was sampled at two distinct stratigraphic layers for petrographic and geochemical analysis of major and trace elements. The sandstone of the Tredian Formation is sub‐feldspathic to feldspathic arenite with sub‐angular to rounded grains that are moderately to extensively sorted. The relative proportions of the quartz, feldspars and lithoclasts in the examined sandstone samples shows that the Tredian sediments originated from the interior of the craton during a transitional continental regime. Chemical index of alteration values of 59, chemical index of weathering values of 67, and plagioclase index of alteration values of 74.5 indicate a low to moderate degree of weathering in the Tredian sediment source region. Based on the silica content, SiO2/Al2O3 ratios (2.7–6.1; mean 4.1), and chemical maturity index, it is deduced that the Tredian Formation was deposited in chemically immature to sub‐mature and dry to semi‐arid conditions. Geochemical proxies indicate the acidic source of sediment and deposition on the passive margin of the Indian Plate. The trace element characteristics of the sediments, especially the Rb/Sr, Cu/Zn, Ni/Co, V/Cr and Sr/Ba ratios, indicate that the sediments originated from the first weathering cycle and support the notion that they were deposited in an oxidising continental environment. A semi‐arid to arid palaeoclimate predominated through the Middle Triassic at the north‐western passive continental margin of the Indian Plate in the south‐eastern Neo‐Tethys.

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Trace and rare earth element geochemistry of the Upper Triassic mudstones in the southern Ordos Basin, Central China

Cited by 68 publications

References 51 publications

Late Permian–Triassic siliciclastic provenance, palaeogeography, and crustal growth of the Songpan terrane, eastern Tibetan Plateau: evidence from U–Pb ages, trace elements, and Hf isotopes of detrital zircons

Late Permian–Triassic siliciclastic provenance, palaeogeography, and crustal growth of the Songpan terrane, eastern Tibetan Plateau: evidence from U–Pb ages, trace elements, and Hf isotopes of detrital zircons

Trace and rare earth element geochemistry of crude oils and their coexisting water from the Jiyuan Area of the Ordos Basin, N China

An integrated petrographical and geochemical study of the Tredian Formation in the Salt and Trans‐Indus Surghar ranges, North‐West Pakistan: Implications for palaeoclimate

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