Article
Geochemistry & Geophysics
Camila Pineda, Axel K. Schmitt, Diego Morata
Summary: Zircon is a widely studied mineral for geochronology, and its Th/U ratios play a critical role in isochron dating and radiometric age correction. However, the processes causing Th/U variations in zircon crystals are not fully understood. This study presents new data on the Th/U ratios and ages of zircon from a volcanic eruption in central Chile, providing important insights into the factors influencing Th/U ratios in zircon.
Article
Geology
Fei Sun, Jing-bo Zhang, Rui Wang, Li-min Zhou, Heejin Jeon, Yu-yao Li, Qing-wen Xue, Si-yu Liu, Na Guo, Chen-hao Luo, Wen-jie Xia
Summary: The study suggests that the main ore-forming magma of the Jiama deposit was derived from the remelting of the newly formed lower crust, and there was no significant mixing of magma during the ascent from the lower crust to the surface. This finding is important for understanding the formation process of giant porphyry deposits in post-collisional settings.
ORE GEOLOGY REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Govind Oinam, A. Krishnakanta Singh, Amrita Dutt, Shoraisam Khogenkumar, Mallickarjun Joshi, Saurabh Singhal, R. K. Bikramaditya
Summary: This study investigates the Abor magmatic rocks from the eastern Himalayan syntaxis, providing insights into the magmatism during the assembly and break-up events of the Gondwana supercontinent. The analysis of zircon U-Pb dating, whole-rock geochemistry, and Sr-Nd isotopic ratios reveals two temporally separated episodes of magmatism, representing the remnants of the eastern Gondwana continental margin. The findings suggest fractional crystallization and low degree partial melting as the processes involved in the formation of these rocks.
Article
Geosciences, Multidisciplinary
Ze-Ming Zhang, Hui-Xia Ding, Xin Dong, Zuo-Lin Tian, Richard M. Palin, M. Santosh, Yan-Fei Chen, Yuan-Yuan Jiang, Sheng-Kai Qin, Dong-Yan Kang, Wen-Tan Li
Summary: This paper investigates the formation and evolution processes of the Gangdese arc in southern Tibet through the study of Mesozoic magmatic rocks. The arc experienced different tectonic, magmatic, and metamorphic evolution stages, including normal subduction, shallow subduction, mid-oceanic ridge subduction, and flat subduction.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geology
Qiang Xu, Zhenyu Li, Reinhard Wolff, Xiucheng Tan, Ralf Hetzel, Yahui Yue, Xianchun Tang
Summary: The Late Miocene-Pleistocene Gyirong Basin in the central Himalaya provides a record of basin evolution in response to tectonic extension within the active Himalaya orogen. The basin fill can be subdivided into four stratigraphic units with distinctly different lithofacies associations, reflecting significant changes of depositional sources and tectonic boundary conditions through time. From alluvial fan to braided river, the different lithofacies associations indicate the evolution of depositional environments during the basin's evolution.
SEDIMENTARY GEOLOGY
(2021)
Article
Geochemistry & Geophysics
Xiang Sun, Cheng-Biao Leng, Pete Hollings, Qing-Jie Song, Ru-Yue Li, Xiu-Quan Wan
Summary: This study on the Zhunuo porphyry copper deposit in southern Tibet reveals the mineralization processes formed and terminated at different periods, as well as the impact brought by magmatic-hydrothermal activity. The research highlights two distinct pulses of magmatic-hydrothermal activity within Zhunuo, as well as three cooling events characterized by different rates of cooling and uplift/exhumation.
MINERALIUM DEPOSITA
(2021)
Article
Geology
Shuo Zhang, Xing Jian, Alex Pullen, Ling Fu, Hanghai Liang, Dongming Hong, Wei Zhang
Summary: The study of detrital zircon U-Pb geochronology in river sediments from the Qilian orogenic belt reveals a complex tectono-magmatic history, with distinct age populations suggesting continental aggregation processes and ancient connections to supercontinents. The variability in detrital zircon age populations among different river sand samples highlights the need for caution when using them to track the tectono-magmatic history of complex orogens.
INTERNATIONAL GEOLOGY REVIEW
(2021)
Article
Geochemistry & Geophysics
Qiong-Xia Xia, Yi-Xiang Chen, Ren-Xu Chen, Yong-Fei Zheng
Summary: The elevated Hf isotope compositions of peritectic zircons in anatectic granites do not accurately reflect the Hf isotope composition of parental rocks, due to the decomposed minerals with high Lu/Hf ratios during crustal anatexis. Care must be taken when using Hf isotope ratios to trace the nature of parental rocks with respect to magmatic processes and crustal evolution.
Article
Geosciences, Multidisciplinary
Pei-yuan Hu, Qing-guo Zhai, Peter A. Cawood, Guo-chun Zhao, Jun Wang, Yue Tang, Zhi-cai Zhu, Wei Wang, Hao Wu
Summary: This study reveals the significant role of the North Lhasa terrane in Cambrian magmatism, showing a long history of magmatic activity in the region through the integration of geochemical, isotopic, and geochronological data analysis, closely related to the tectonic evolution of northern Gondwana.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2021)
Article
Geosciences, Multidisciplinary
Feng Huang, Tyrone O. Rooney, Ji-Feng Xu, Yun-Chuan Zeng
Summary: The study of early Cenozoic mafic rocks in the central part of Lhasa Terrane reveals their geochemical affinity with magmas produced by fluid-fluxed melting in a subduction zone environment. This indicates ongoing magmatism during the transitional phase between the onset of India-Asia continental collision and Neo-Tethyan slab breakoff. Geochemical forward modeling results suggest significant fluid additions from the Neo-Tethyan slab influenced the conditions of melt generation in these rocks.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2021)
Article
Geochemistry & Geophysics
Zipei Guo, Haibo Zou
Summary: The study found decoupling of zircon and whole-rock Hf isotopes in lavas from Dayingshan volcano, with zircon epsilon(Hf) values differing from whole-rock values. This decoupling is attributed to open-system magmatic processes rather than disequilibrium partial melting.
Article
Geosciences, Multidisciplinary
Chen-Hao Luo, Rui Wang, Roberto F. Weinberg, Zengqian Hou
Summary: In summary, this study investigates crustal growth in the Gangdese belt and its relationship with porphyry deposit formation, revealing significant variations in isotopic and geochemical characteristics among different arc periods. The Miocene magmatic rocks exhibit distinct features with higher Mg# and more evolved isotopic compositions compared to preceding arcs. This suggests the involvement of different sources in the formation of Miocene magmas, with hybridization playing a key role in crustal growth and porphyry deposit formation in the collisional orogen.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geochemistry & Geophysics
Charlotte Fredriksson, Victoria Pease
Summary: This study investigates the geological structure of northern Alaska and identifies the uplift process of the Brooks Range during the Early Cretaceous. By analyzing the age, chemistry, and isotopic data of igneous clasts and samples, it is concluded that the igneous clasts mainly originate from the Brooks Range ophiolite. A revised tectonic model is proposed that integrates the formation of Late Triassic island arc with the evolution of the Brooks Range ophiolite.
Article
Geosciences, Multidisciplinary
Huanhuan Yang, Xiang Fang, Yang Song, Bin Lin, Yanbo LI, Qin Wang, Zhibo Liu, Long He, Qi Zhang, Xuelian Fu
Summary: This study investigates the thermal history of the Naruo porphyry copper deposit in central Tibet through thermal modeling and age data analysis. The findings suggest that multiple magmatic events and the thermal effect of a strike-slip fault have played a significant role in the formation and evolution of the deposit.
ACTA GEOLOGICA SINICA-ENGLISH EDITION
(2022)
Article
Geology
Martim Chichorro, Ana Rita Sola, Telmo Bento dos Santos, Joao Lains Amaral, Lourenco Crispim
Summary: This study assessed the age distribution of Cadomian/Pan-African orogenic events in the Iberian Massif using detrital and inherited zircon analysis. The results showed a systematic peak at around 610Ma during the late Neoproterozoic-to-Early Ordovician era, followed by peaks at typical Cadomian ages. Inherited zircons in Cambrian-to-Lower Ordovician igneous rocks also exhibited typical Cadomian ages, but consistently showed a peak at around 610Ma. This suggests that Pan-African magmatism played a significant role in the geological history of the Iberian Massif.
Article
Geology
Trevor A. Dumitru, William P. Elder, Jeremy K. Hourigan, Alan D. Chapman, Stephan A. Graham, John Wakabayashi
Article
Geochemistry & Geophysics
Melanie J. Michalak, Sarah R. Hall, Daniel L. Farber, Laurence Audin, Jeremy K. Hourigan
Article
Geosciences, Multidisciplinary
Timothy M. O'brien, Elizabeth L. Miller, Victoria Pease, Leslie A. Hayden, Christopher M. Fisher, Jeremy K. Hourigan, Jeff D. Vervoort
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2018)
Article
Geology
Carl E. Jacobson, Jeremy K. Hourigan, Gordon B. Haxel, Marty Grove
Article
Geosciences, Multidisciplinary
Glenn R. Sharman, Theresa M. Schwartz, Lauren E. Shumaker, Cody R. Trigg, Nora M. Nieminski, Zachary T. Sickmann, Matthew A. Malkowski, Jeremy K. Hourigan, Benjamin J. Schulein, Stephan A. Graham
Article
Geochemistry & Geophysics
Danielle Ziva Shulaker, Jeremy K. Hourigan, Marty Grove
Article
Geosciences, Multidisciplinary
Guangsheng Zhuang, Samuel A. Johnstone, Jeremy Hourigan, Bradley Ritts, Alexander Robinson, Edward R. Sobel
Article
Geochemistry & Geophysics
Danielle Ziva Shulaker, Marty Grove, Jeremy K. Hourigan, Nicholas Van Buer, Glenn Sharman, Keith Howard, Jonathan Miller, Andrew P. Barth
EARTH AND PLANETARY SCIENCE LETTERS
(2019)
Article
Geosciences, Multidisciplinary
Guangsheng Zhuang, Yi Ge Zhang, Jeremy Hourigan, Bradley Ritts, Michael Hren, Mingqiu Hou, Minghao Wu, Bumsoo Kim
GEOPHYSICAL RESEARCH LETTERS
(2019)
Article
Geosciences, Multidisciplinary
David Auerbach Colwyn, Mark T. Brandon, Michael T. Hren, Jeremy Hourigan, Astrid Pacini, Martha G. Cosgrove, Maya Midzik, Rene D. Garreaud, Christine Metzger
AMERICAN JOURNAL OF SCIENCE
(2019)
Article
Geosciences, Multidisciplinary
Jin-Gen Dai, Matthew Fox, David L. Shuster, Jeremy Hourigan, Xu Han, Ya-Lin Li, Cheng-Shan Wang
Article
Geosciences, Multidisciplinary
Vladislav Powerman, Richard Hanson, Anna Nosova, Gary H. Girty, Jeremy Hourigan, Andrei Tretiakov
Article
Multidisciplinary Sciences
C. D. Willett, K. F. Ma, M. T. Brandon, J. K. Hourigan, E. C. Christeleit, D. L. Shuster
Article
Geochemistry & Geophysics
N. V. Tsukanov, M. V. Luchitskaya, M. V. Portnyagin, D. P. Savelyev, A. V. Soloviev, J. K. Hourigan
Summary: New U-Pb (LA-ICP-MS) geochronological data from accessory zircons suggest that the Shipunsky massif was formed in the Paleocene-Eocene period through two stages of gabbroid and quartz diorite-granodiorite intrusions. Petrographic and geochemical analysis shows that the granitoids in the Shipunsky massif belong to the I-type granites, indicating a suprasubduction setting. This massif represents a part of the Kronotsky intraoceanic paleoarc and was brought to the surface through collision with the Kamchatka continental margin.
Article
Geochemistry & Geophysics
I. D. Sobolev, A. A. Soboleva, O. V. Udoratina, D. A. Varlamov, J. K. Hourigan, V. B. Khubanov, M. D. Buyantuev, D. A. Soboleva