A new 1.32 Ga Tianshui mafic sill in the Liaodong area and its relations to the Yanliao large igneous province in the northern North China Craton

This paper discusses the tail of Emeishan mantle plume and suggests that it locates in Miyi—Yongren area, southern Sichuan—northern Yunnan. On the basis of the classic mantle plume theory, the estimated diameter of Emeishan plume tail was 65~105km when it reached the upper mantle. Picrite distributions and sedimentary responses showed that the center zone of the Emeishan plume was ca. 260~300km wide. Eruption and outcropping of flood basalts were constrained by deep-seated faults and paleogeomorphology, which resulted in the concentration of picrite in the west of the Emeishan large igneous province.

Mantle plume

Flood basalt

Large igneous province

Source

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Citations (2)

Nature and timing of Franklin igneous events, Canada: Implications for a Late Proterozoic mantle plume and the break-up of Laurentia

Earth and Planetary Science Letters (1992)

Larry M. Heaman A N LeCheminant R H Rainbird

Laurentia

Mantle plume

Baddeleyite

Large igneous province

Sill

Flood basalt

Geochronology

10.1016/0012-821x(92)90078-a

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Citations (361)

Dykes of the 1.11Ga Umkondo LIP, Southern Africa: Clues to a complex plumbing system

Precambrian Research (2014)

Michiel de Kock Richard E. Ernst Ulf Söderlund Fred Jourdan Axel Hofmann

Mantle plume

Baddeleyite

Large igneous province

Rodinia

10.1016/j.precamres.2014.05.006

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Citations (66)

Geochemical Constraints on the Mantle Source of the Upper Permian Emeishan Continental Flood Basalts, Southwestern China

International Geology Review (2001)

Xie‐Yan Song Mei‐Fu Zhou Zheng-Qian Hou Zhimin Cao Yunliang Wang

Abstract The widespread Emeishan igneous province in southwestern China comprises the Emeishan continental flood basalts (ECFB) and associated mafie-ultramafic intrusions. The ECFB have variable SiO2, ranging from 43.6 to 52.1 wt%, Al2O3 from 5.0 to 12.6 wt%, and total alkali (K2O + Na2O) from 0.7 to 6.5 wt%. These oxides exhibit negative correlations with MgO (5.4 - 23.1 wt%), implying fractional crystallization of olivine and clinopyroxene, which occur as phenocrysts in the rocks. Linear correlations between Zr, Nb, and La suggest that crustal contamination is not important. The primitive-mantle-normalized trace-element patterns show that the ECFB are enriched in high-field-strength trace elements, large-ion-lithophile elements, and light-rare-earth elements, similar to ocean-island basalt. Incompatible element ratios of the ECFB, such as Zr/Nb (7-10), Th/La (0.1-0.15), and Rb/Nb (0.9-1.7), differ from those of primitive mantle, N-MORB, and continental crust, but are similar to ocean-island basalts from an enriched mantle source (EM-1). However, the ECFB have isotopic ratios (143Nd/144Nd = 0.51229 -0.51276 and 87Sr/86Sr = 0.70480-0.70647) that imply that the ECFB were derived from a homogeneous, primitive lower mantle carried upward by a mantle plume. We propose that the original melts derived from the mantle plume were contaminated through interaction at shallower depth with an enriched lithospheric mantle. This model suggests that the lithospheric mantle beneath the ECFB was modified by subduction of an oceanic slab.

Flood basalt

Mantle plume

Large igneous province

Crustal recycling

Primitive mantle

Fractional crystallization (geology)

Incompatible element

10.1080/00206810109465009

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Citations (165)

Fragments of Paleoproterozoic Large Igneous Provinces in Northern Fennoscandia: Baddeleyite U–Pb Age Data for Mafic Dykes and Sills

Doklady Earth Sciences (2020)

Е. Б. Сальникова А. В. Самсонов A. V. Stepanova R. V. Veselovskiy С. В. Егорова

Baddeleyite

Sill

Dike

Baltic Shield

Large igneous province

10.1134/s1028334x20040145

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Citations (5)

New U–Pb baddeleyite age, and AMS and paleomagnetic data for dolerites in the Lake Onega region belonging to the 1.98–1.95 Ga regional Pechenga–Onega Large Igneous Province

GFF (2016)

N. V. Lubnina A. V. Stepanova Richard E. Ernst Mimmi Nilsson Ulf Söderlund

A new U–Pb baddeleyite age of 1970 ± 3 Ma for the Unoi dolerite sill of the Onega structure of Karelia craton matches other 1.98–1.95 Ga units across the Kola craton (Pechenga) and widely separated parts of the Karelian craton, including the Lake Onega sill area and a extensive NW-trending dolerite dyke swarm. Herein these coeval units are combined into the Pechenga–Onega Large Igneous Province. The sills in the Lake Onega area exhibit similar geochemical patterns, although the Unoi dolerite sills appear less contaminated and less differentiated than the Pudozhgora intrusion, Gabnev sill and Koikary-Svatnavolok and Palieyeozero sills but are similar to other doleritic sills in the northern part of the Onega structure. New AMS data from sills are consistent with emplacement along the same NW–SE trend as the dykes, consistent with the dykes acting as their feeder system. Paleomagnetic data obtained on 1.98–1.95 Ga magmatic rocks result in a new robust paleopole for the Karelian craton and accentuate its variable paleolatitude and paleoorientation during the Paleoproterozoic.

Sill

Baddeleyite

Large igneous province

Swaging

Dike

Geochronology

10.1080/11035897.2015.1129549

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Citations (30)