Gang Lu

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Zircon U–Pb Dating of Tuff Layers in the Middle–Upper Triassic Strata of Successions and Sedimentation of Chang 7 Member in the Ordos Basin, China

Frontiers in Earth Science (2022)

Gang Lu Mingxing Gou Guanglin Liu Changcheng Wang Zhi‐Qiang Shi

During the Late Triassic, the southern margin of the Ordos Basin was influenced by the Indosinian Movement, in response to closure of the Paleo-Tethys Ocean. Thinly bedded tuff layers are exposed near the base of the Middle–Upper Triassic formations (Chang 8/7/6 members) in the Ordos Basin. Tuff samples from drilling core (well An-35) and outcrop (Motiangou section) samples in the Yanchang Formation were studied by the detailed field work. Igneous zircon crystals were picked and analyzed by the instruments of cathodoluminescence and laser ablation inductively coupled plasma mass spectrometery (LA-ICP-MS). The timing of volcanic activity was determined by means of high-precision zircon age. Combining tectonic setting and paleogeographic reconstruct, the ages of tuff layers indicate that volcanic activities occurred at three peaks (241.6 ± 1.1 Ma, 240.2 ± 1.1 Ma, and 233.5 ± 1.2 Ma) from the top of Chang 8 Member to the Chang 7 Member. The results implied that the volcanic activities lasted from Ladinian to Carnian, as well as define the sedimentary duration of the Chang 7 Member with a deposition rate of 1.34 cm/ka.

Outcrop

Ladinian

Conglomerate

10.3389/feart.2022.908940

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Citations (2)

Restoring the source-to-sink relationships in the Paleogene foreland basins in the Central and Southern Alps (Switzerland, Italy, France): a detrital zircon study approach

International Journal of Earth Sciences (2019)

Gang Lu Andrea Di Capua Wilfried Winkler Meinert Rahn Marcel Guillong

Paleogene

Neogene

Peralkaline rock

Conglomerate

10.1007/s00531-019-01734-6

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Citations (20)

A genetic link between remagnetization and potassic metasomatism in the Devonian Onondaga Formation, Northern Appalachian Basin

Geophysical Research Letters (1991)

Gang Lu Chad McCabe Jeffrey S. Hanor Ray E. Ferrell

Whole‐rock chemical analyses indicate that the Onondaga Formation along a Rochester‐Syracuse (New York) transect has a marked eastward increasing trend in K/Al ratio, which correlates with an increase in authigenic magnetite content and degree of diagenetic illitization. An eastward increase in the content of some authigenic minerals including K‐feldspar, quartz, and Fe‐rich chlorite in the rocks is indicated by petrographic and X‐ray diffraction studies. These observations suggest a link between remagnetization and potassic alteration of Fe‐bearing silicates in the Onondaga. Two hypothetical reactions are proposed in which magnetite authigenesis is related to the breakdown of Fe‐bearing smectite in the presence of potassium. Products of these reactions include authigenic K‐feldspar, illite, quartz and chlorite, as well as magnetite. Our results suggest that remagnetization was triggered by a basin‐wide migration of K‐rich fluids during the Alleghenian Orogeny.

Authigenic

Illite

10.1029/91gl02665

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Citations (36)

Tectonic–paleogeographic evolution of the Late Triassic in the Sichuan basin, SW China: Constraints from sedimentary facies and provenance analysis of the Xujiahe Formation

Marine and Petroleum Geology (2023)

Mingxing Gou Gang Lu Bin Deng Changcheng Wang Zhiwu Li

Continental Margin

Passive margin

10.1016/j.marpetgeo.2023.106649

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Citations (3)

Revealing exhumation of the central Alps during the Early Oligocene by detrital zircon U–Pb age and fission-track double dating in the Taveyannaz Formation

International Journal of Earth Sciences (2020)

Gang Lu Maria Giuditta Fellin Wilfried Winkler Meinert Rahn Marcel Guillong

Abstract The late Eocene-to-early Oligocene Taveyannaz Formation is a turbidite series deposited in the Northern Alpine Foreland Basin (close to the Alpine orogenic front). Double dating of zircons with the fission-track and the U–Pb methods is applied on samples from the Taveyannaz Formation to reconstruct the exhumation history of the Central-Western Alps and to understand the syn-collisional magmatism along the Periadriatic lineament. Three samples from this unit show similar detrital zircon fission-track age populations that center at: 33–40 Ma (20%); 69–92 Ma (30–40%); and 138–239 Ma (40–50%). The youngest population contains both syn-volcanic and basement grains. Combined with zircon U–Pb data, it suggests that the basement rocks of Apulian-affinity nappes (Margna Sesia, Austroalpine) were the major sources of detritus, together with the Ivrea Zone and recycled Prealpine flysch, that contributed debris to the Northern Alpine Foreland Basin. Furthermore, the rocks of the Sesia–Lanzo Zone or of equivalent units exposed at that time presumably provided the youngest basement zircon fission-track ages to the basin. The Biella volcanic suite was the source of volcanogenic zircons. Oligocene sediment pathways from source to sink crossed further crystalline basement units and sedimentary covers before entering the basin from the southeast. The lag times of the youngest basement age populations (volcanic zircons excluded) are about 11 Myr. This constrains average moderate-to-high exhumation rate of 0.5–0.6 km/Myr in the pro-side of the orogenic wedge of the Central Alps during the late Eocene to early Oligocene.

Basement

Fission track dating

Massif

Detritus

10.1007/s00531-020-01910-z

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Citations (9)

THE LAOPENG MARL SPONGES ALGAE REEF OF LATER PERMIAN IN TIAN'E, GUANGXI

Guangxi Geology (2000)

Gang Lu

It has been discovered in lower part of the Heshan formation that laopeng marl sponges algae reef had deposited in the Wujiaping stage ( later Permian ) . The reef which based on coal-limestone belongs a group of point-reef with a shap of round knoll , which developed in the baeeier beach-mound of isolated platform with low emerge--deeper water and a tranquil environment . Its reef building organtsm is composed of fungus algae and sphinctozoan sponges , in part by inozoan calcareous porifera , hydra , tabular sponges , etc . The types of reef rock includes massive bed marl limestone ( hidebindstone , hidebafflestone ) , prebafflestone , etc. It is diffrence develop made from early Period to later Period. In view of the construction of laopeng reef and the characteristics of reef-forming at sponge . It is believed that the Permian sponge-limestone with tremendous thickness is a biologic reef , which developed in margin of platform. The growth of fungus-algae is important role in the construction of reef.

Marl

Sponge

Coralline algae

Source

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Citations (0)

Evaluating igneous sources of the Taveyannaz formation in the Central Alps by detrital zircon U–Pb age dating and geochemistry

Swiss Journal of Geosciences (2018)

Gang Lu Wilfried Winkler Meinert Rahn Albrecht von Quadt Sean D. Willett

Flysch

Paleogene

Geochronology

10.1007/s00015-018-0302-y

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Citations (34)

阿尔卑斯古近纪火山活动的沉积记录及其地质意义

Earth Science-Journal of China University of Geosciences (2025)

Gang Lu Liang Gao Changcheng Wang X. Chen Xihe Lu

10.3799/dqkx.2024.021

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The tectono-sedimentary evolution of North Helvetic Flysch basin in Central Alps as revealed by detrital zircon U-Pb age dating and Hf isotope geochemistry

EGUGA (2017)

Gang Lu Wilfried Winkler Sean D. Willett Meinert Rahn

Flysch

Isotope Geochemistry

Source

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Magnetic fabric determined from Arm and IRM anisotropies in Paleozoic carbonates, Southern Appalachian Basin

Geophysical Research Letters (1993)

Gang Lu Chad McCabe

We have undertaken a comparative study of ARM and IRM anisotropies in Paleozoic carbonate rocks from the Nashville and Jessamine Domes in the Southern Appalachian Basin. The ARMA ellipsoids differ markedly from the IRMA ellipsoids. ARMA appears to reflect a pre‐deformation magnetic fabric due to deposition and/or compaction with minimum axes near vertical and a weak lineation. Conversely, IRMA has minimum axes near horizontal and oriented NE‐SW, which is compatible with a tectonic fabric due to Alleghanian deformation. Percent ARMA is consistently greater than IRMA. ARM was imparted at low alternating fields (30 mT), and thus ARMA may reflect the fabric residing in low and intermediate coercivity (coarse grained) magnetite. However, the IRM was imparted in saturating fields (300 mT) and appears to be dominated by the single domain fraction, which is believed to carry the observed Kiaman Superchron remagnetization.

Lineation

10.1029/93gl00986

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Citations (7)