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:: Quote of the week ::
"Science begins with doubting traditional textbook assertions"
– Richard Feynman
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.
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.–
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
, Ed. Zdenek Kopal. Academic Press, N.Y. & London, pp. 283-359. Physics and Astronomy of the Moon
"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
direction from that expected???? ( opposite 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.)