Distribution of Fluorine between Minerals and Glass in Lamproites, Lamprophyres and Kamafugites: Implications for the Role of F in Deep Mantle-Derived Magmas

THE ROLE OF DEEP MANTLE FLOW IN SHAPING THE HAWAIIAN-EMPEROR BEND

10.1130/abs/2017cd-293041 ◽

2017 ◽

Author(s):

Simon Williams ◽

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Rakib Hassan ◽

Dietmar Müller ◽

Michael Gurnis ◽

...

Keyword(s):

Mantle Flow ◽

Deep Mantle

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Role of the deep mantle in generating the compositional asymmetry of the Hawaiian mantle plume

Nature Geoscience ◽

10.1038/ngeo1328 ◽

2011 ◽

Vol 4 (12) ◽

pp. 831-838 ◽

Cited By ~ 131

Author(s):

Dominique Weis ◽

Michael O. Garcia ◽

J. Michael Rhodes ◽

Mark Jellinek ◽

James S. Scoates

Keyword(s):

Mantle Plume ◽

Deep Mantle

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The role of megacontinents in the supercontinent cycle

Geology ◽

10.1130/g47988.1 ◽

2020 ◽

Author(s):

Chong Wang ◽

Ross N. Mitchell ◽

J. Brendan Murphy ◽

Peng Peng ◽

Christopher J. Spencer

Keyword(s):

Specific Location ◽

Geodynamic Model ◽

The Past ◽

Deep Mantle ◽

Supercontinent Cycle

Supercontinent Pangea was preceded by the formation of Gondwana, a “megacontinent” about half the size of Pangea. There is much debate, however, over what role the assembly of the precursor megacontinent played in the Pangean supercontinent cycle. Here we demonstrate that the past three cycles of supercontinent amalgamation were each preceded by ~200 m.y. by the assembly of a megacontinent akin to Gondwana, and that the building of a megacontinent is a geodynamically important precursor to supercontinent amalgamation. The recent assembly of Eurasia is considered as a fourth megacontinent associated with future supercontinent Amasia. We use constraints from seismology of the deep mantle for Eurasia and paleogeography for Gondwana to develop a geodynamic model for megacontinent assembly and subsequent supercontinent amalgamation. As a supercontinent breaks up, a megacontinent assembles along the subduction girdle that encircled it, at a specific location where the downwelling is most intense. The megacontinent then migrates along the girdle where it collides with other continents to form a supercontinent. The geometry of this model is consistent with the kinematic transitions from Rodinia to Gondwana to Pangea.

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