Large Igneous Provinces and their Plumbing Systems
Identification of large-volume, short-duration mafic magmatic events of intraplate affinity in both continental and oceanic settings on the Earth and other planets provides invaluable clues for understanding several vital geological issues of current concern. Of particular importance is understanding the assembly and dispersal of supercontinents through Earth's history, dramatic climate change events including mass extinctions, and processes that have produced a wide range of large igneous province (LIP)-related resources, such as Ni–Cu–PGE, Au, U, base metals and petroleum. This volume comprises 21 contributions on the latest developments and new information on LIPs and their plumbing systems and presents methodical studies on different components of LIP plumbing systems. These articles are especially helpful in understanding continental break-up events, regional domal uplift and a variety of metallogenic systems, as well as the temporal and spatial distribution of LIPs, their origin and their likely links to mantle plumes/superplumes.
Highly magmatic break-up LIP centres: revisiting the East Greenland volcanic rifted margin
Published:March 09, 2022
Martin B. Klausen, 2022. "Highly magmatic break-up LIP centres: revisiting the East Greenland volcanic rifted margin", Large Igneous Provinces and their Plumbing Systems, Rajesh K. Srivastava, Richard E. Ernst, Kenneth L. Buchan, Michiel de Kock
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The decompressional release of magma at continental triple-rift break-up, large igneous province (LIP) centres, above mantle plume stems, results in highly magmatic settings. As a particularly well-exposed example, it is proposed that the East Greenland coastal dyke swarm preserves a structural record of how dyke dilations v. tectonic extension increased upon approaching its Kangerlussuaq triple rift centre. Such more magmatic break-up is reflected by how abruptly its volcanic rifted margin transitions into 100% dykes, and, in this case, up to 100 km further inland than its geophysically determined continent–ocean boundary. Correspondingly high magma flux through an igneous Kap Edward Holm centre sustained the lateral injection of up to 150 km-long dykes, evidenced by increased cut-off dyke thicknesses, below which there is an anomalously low abundance of thinner dykes, that conform to the cube root of their thermal arrest distance. Only the thickest and, thereby, longest dyke injections linked up with a more southerly located igneous Imilik centre of an en echelon offset dyke swarm, the complex transition into which is also addressed. This highly magmatic central plumbing system is further compared to similar volcanic zones across Iceland and other post-Paleozoic break-up LIPs in order to contextualize its importance.