Results 61 to 70 of about 4,118 (239)

Stardust Mine: A 2024 gabbroic shergottite from Arizona, USA

Meteoritics &Planetary Science, EarlyView.
Abstract This study provides an initial characterization of Stardust Mine, a fresh gabbroic enriched shergottite collected in Arizona, USA, in September 2024 and is the first Martian meteorite to be unequivocably collected on US soil. Analysis was conducted on the type specimen and finds that Stardust Mine is composed of equal proportions of pyroxene ...
Jennifer T. Mitchell, Natasha R. Stephen, Zsuzsanna P. Allerton, Weiming Ding, Xin‐Yuan Zheng   +4 more
wiley   +1 more source

Holocene ice sheet dynamics and detrital provenance shifts along the West Greenland Margin recorded by radiogenic isotopes (Sr, Nd, Pb) [PDF]

, 2021
Due to the effect of Arctic Amplification the Arctic is currently warming at least twice as fast as the rest of the planet. Seasonal sea-ice extent has been alarmingly declining in the past decade.
Madaj, Lina
core   +1 more source

Current status and potentials of enhanced geothermal system in the Eastern Pontide Orogenic Belt, Turkey

International Journal of Renewable Energy Development
The radioactive decay of isotopes is one of the most important sources of heat in the Earth's interior. The main radiogenic elements in the crust are U, Th, and K in granitoids.
Mehmet Furkan Şener
doaj   +1 more source

Evaluating maturity of organic matter in hydrated C1 and CM‐like clasts and a dehydrated clast within a polymict eucrite and a howardite

Meteoritics &Planetary Science, EarlyView.
Abstract Volatile‐rich xenolithic clasts in different types of brecciated meteorites represent unique pristine solar system material. This study investigates the maturity and thermal history of organic matter using Raman spectroscopy and aqueous alteration effects using infrared spectroscopy in the matrix of 15 volatile‐rich clasts (C1 and CM‐like ...
Swarna Prava Das, Alessandro Maturilli, Aurélie Van den Neucker, Markus Patzek, Dipak Kumar Panda, Gopal K. Pradhan, Guneshwar Thangjam, Surya Snata Rout   +7 more
wiley   +1 more source

Contrasting Mechanisms Controlling Pb Isotopes of Dust in Inland and Marine Archives

Geophysical Research Letters
Lead (Pb) isotopes are powerful tools for tracing dust provenance and reconstructing paleoclimate. However, variations in Pb isotopic compositions among different grain‐size fractions in sediments complicate their use.
Ruxi Dou, Jianjun Zou, Xuefa Shi, Zhi Dong, Yonghua Wu, Aimei Zhu, Xuguang Feng, Xinqing Zou, Sergey Gorbarenko, Yuriy Vasilenko, Aleksandr Bosin   +10 more
doaj   +1 more source

Radiogenic isotopes document the start of subduction in the Western Pacific [PDF]

Earth and Planetary Science Letters, 2019
Subduction initiation is one of the least understood aspects of plate tectonics. In an effort to obtain the first in situ magmatic record of subduction initiation, the International Ocean Discovery Program Expedition 352 drilled at four sites in the inner trench wall of the Bonin Trench to recover 1.22 km of oceanic upper crust accreted within a few m ...
Hong-Yan Li, Rex N. Taylor, Julie Prytulak, Maria Kirchenbaur, John W. Shervais, Jeffrey G. Ryan, Marguerite Godard, Mark K. Reagan, Julian A. Pearce   +8 more
openaire   +2 more sources

The Ames impact structure, Oklahoma: New radioisotopic constraints and implications for North American impact chronology

Meteoritics &Planetary Science, EarlyView.
Abstract The Ames impact structure (Oklahoma) is thought to have formed during the Ordovician Meteor Event, based on conodont biostratigraphy of its crater fill. Here, U–Pb zircon dates from its impact‐melt portion, conducted using secondary ion mass spectrometry and laser ablation–inductively coupled plasma–mass spectrometry (n = 37 spots), yield a ...
Elizabeth J. Catlos, Andrew F. Parisi, Michael E. Brookfield, Timmons Erickson, Sean P.S. Gulick, Axel K. Schmitt, Daniel F. Stockli, Daniel P. Miggins, Ben Ruchte, Mark Cloos   +9 more
wiley   +1 more source

Potassium isotopic compositions and exposure ages of evolved and silica‐rich achondrites

Meteoritics &Planetary Science, EarlyView.
Abstract Some of the oldest igneous rocks in the Solar System include evolved and silica‐rich achondrites that originate from parent bodies less than 1000 km in diameter, referred to as planetesimals. While Earth was initially in a molten state and required continental crust formation and plate tectonics to generate andesite bulk compositions, evolved ...
Z. Vaci, Z. Tian, P. Koefoed, M. Habermann, M. Humayun, K. Ziegler, H. Busemann, D. Krietsch, J. M. D. Day, K. Wang   +9 more
wiley   +1 more source

Impact provenance and age of a unique basalt found in Apollo 12 regolith

Meteoritics &Planetary Science, EarlyView.
Abstract Basaltic sample 12032,366‐18 from the Apollo 12 landing site is distinct among basalts collected at this site, other Apollo landing sites, and lunar meteorites in terms of its age, bulk rock composition, and isotopic composition. We present new Pb isotopic data obtained by in situ Secondary Ion Mass Spectrometry on multiple mineral phases in ...
C. Deligny, M. J. Whitehouse, R. E. Merle, H. Jeon, A. A. Nemchin, B. L. Jolliff   +5 more
wiley   +1 more source

Heavy iron isotopes in arc rocks reveal anoxic sediment recycling in subduction zones

Communications Earth & Environment
The formation mechanism of arc mafic rocks with heavy iron isotope signature remains enigmatic. Here we report Fe-Mo-Sr-Nd-Hf isotope data of arc rocks from Northeast China. The studied arc rocks have δ56Fe values (0.08‰ to 0.23‰) comparable to or higher
Zhigang Wang, Li-Qun Dai, Zi-Fu Zhao, Li-Tao Ma, Wei Fang, Xing-Mian Hu   +5 more
doaj   +1 more source