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 What are the origins of 'hot spot' volcanism?

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::A glance at today's paper::  

Zhensheng Wang, F. Capitanio, Zaicong Wang, and T.M. Kusky. Accretion of the cratonic mantle lithosphere via massive regional relamination. Proc. Nat. Acad. Sci., 2022, 119 (39) e2201226119.

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Don L. Anderson

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Catastrophic growth of totally molten magma chambers in months to years

C. Annen, R. Latypov, S. Chistyakova, A.R. Cruden& T.F. D. Nielsen

Accretion of the cratonic mantle lithosphere via massive regional relamination (MRR)

Zhensheng Wan, F. A. Capitanio, Zaicong Wang & T.M. Kusky

EGU 2023 General Assembly on 23-28 April 2023 in Vienna

Session TS5.1: Continental Rift Evolution: from inception to break-up

Abstract deadline: 10 January 2023

Geocongress 2023
11-13 January, 2023

Stellenbosch University, South Africa

Hybrid meeting – Face to face & Virtual participation

Abstract deadline 15th October

A 5-km-thick reservoir with >380,000 km3 of magma within the ancient Earth's crust

R. Latypov, S. Chistyakova, R.A. Hornsey, G. Costi, & M. van der Merwe

How strongly do plumes influence Pacific seamount distribution?

Yanghui Zhao, B. Riel, G.R. Foulger & Weiwei Ding

Large- to local-scale control of pre-existing structures on continental rifting: examples from the Main Ethiopian Rift, East Africa

G. Corti, D. Maestrelli & F. Sani

Call for papers: Special collection of Scientific Reports

Plate tectonics

Submission deadline: 30 November 2022

Editors: Andrea Billi, Zheng-Xiang Li &

Molybdenum isotope systematics of lavas from the East Pacific Rise: Constraints on the source of enriched mid-ocean-ridge basalt

Shuo Chen, Pu Sun, Yaoling Niu, Pengyuan Guo, T. Elliott, R.C. Hin

A paradigm change:
Lithospheric lid thickness, not mantle potential temperature, controls the extent of mantle melting, depth of melt extraction & basalt compositions in all tectonic settings on Earth

Yaoling Niu


G.R. Foulger, L. Gernigon & L. Geoffroy

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Trace Element and Isotopic Evidence for Recycled Lithosphere from Basalts from 48-53°E, Southwest Indian Ridge

Jixin Wang, Huaiyang Zhou, Vincent J. M. Salters, H.J. B. Dick, J.J. Standish & Conghui Wang
Oliver Strimpel

Gillian Foulger on Explaining Intraplate Volcanism Without Mantle Plumes

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"Science begins with doubting traditional textbook assertions"

– Richard Feynman

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The latest webpage to be posted, "Late Miocene fish fossils in Utah support accelerated extension and subsidence, not thermal uplift or a continental divide in the Eastern Snake River Plain", is an elegant and unusual demonstration that paleontology can contribute to the mantle plumes debate. It is interesting to reflect that paleontology also played a key role in the continental drift debate led by Wegener. –Gillian Foulger
Dear WM, He & Santosh (2020) constructed a regional teleseismic P-wave tomography model for 50-800 km depths in the east Tibetan Plateau and central China using 3D ray tracing/ To the extrusion style generated by collision, the direction changed from eastward to southeastward because of an obstacle of strong lithosphere identified by fast anomalies in the new tomographic image. They proposed that the Emeishan large igneous province was formed by a subducted slab-like high velocity anomaly at depths of 300-700 km and argued it was not generated by mantle plume.–Junjiang Zhu
Dear WM, The new webpage by Panedy & Chalapathi Rao, and their accompanying paper Supercontinent transition: Links to ~1.1 Gyr diamondiferous kimberlites and related rocks in India, provide a very succinct summary of the geological setting of kimberlite fields in India, and the problems of linking alkaline volcanism to a plume.–Andy Moore
Dear WM, Last week we convened our EGU session “The spectrum of obliquity: A multidisciplinary approach from orthogonal rifts to transform tectonics in continental and oceanic settings”. We draw your attention to a proposed special issue in EGU’s journal Solid Earth on the same topic. We welcome the session contributors and the wider geo-tectonics community to submit papers to this special issue. To express interestplease contact Alexander L. Peace

Dear WM, I bring to your attention a quote I found in Shoemaker, E.M., 1962, Interpretation of lunar craters, in Physics and Astronomy of the Moon, Ed. Zdenek Kopal. Academic Press, N.Y. & London, pp. 283-359.

"It has been remarked that the majority of astronomers explain the craters of the moon by volcanic eruption — that is, by an essentially geological process — while a considerable number of geologists are inclined to explain them by the impact of bodies falling on the moon — that is, by an essentially astronomical process.  This suggests that each group of scientists find the craters so difficult to explain by processes with which they are professionally familiar that they have recourse to a process belonging in another field than their own, with which they are probably imperfectly acquainted, and with which they therefore feel freer to take liberties."

(from Davis, W.M., 1926, Biographical memoir of Grove Karl Gilbert, 1843-1918.  Mem. Nat. Acad. Sci. 21, 5th Mem., 303 pp.)–Bruce Julian

Dear WM, I bring to your attention the recent paper Nkere, B. J., W. L. Griffin, and P. E. Janney (2019), Emplacement age of the Tshibwe kimberlite, Democratic Republic of Congo, by in-situ LAM-ICPMS U/Pb dating of groundmass perovskite, Journal of African Earth Sciences, 157, 103502.. The paper is almost matter-of-fact about tectonic triggers and plumes do not even warrant a consideration, which would have been heresy 10 years ago.–Andy Moore

It is well-known that time-progressive volcanic trails are considered by many to be diagnostic of fixed mantle plumes, and that non-time progression is not considered to weigh against the plume hypothesis, but time progression in the opposite direction from that expected???? (Sinton, C. W., F. Hauff, K. Hoernle, and R. Werner (2018), Age progressive volcanism opposite Nazca plate motion: Insights from seamounts on the northeastern margin of the Galapagos Platform, Lithos, 310-311, 342-354.)