Spatial variations of Sr and Nd isotope ratios of Cretaceous-Paleogene granitoid rocks, Southwest Japan Arc

1992 ◽  
Vol 112 (2-3) ◽  
pp. 165-177 ◽  
Author(s):  
H. Kagami ◽  
S. Iizumi ◽  
Y. Tainosho ◽  
M. Owada
Keyword(s):  
Isotope Ratios ◽  
Spatial Variations ◽  
Southwest Japan ◽  
Nd Isotope ◽  
Granitoid Rocks

Sr–Nd isotope ratios of gabbroic and dioritic rocks in a Cretaceous‐Paleogene granite terrain, Southwest Japan

Island Arc ◽  
2000 ◽  
Vol 9 (1) ◽  
pp. 113-127 ◽  
Author(s):  
Shigeru Iizumi ◽  
Teruyoshi Imaoka ◽  
Hiroo Kagami
Keyword(s):  
Isotope Ratios ◽  
Southwest Japan ◽  
Nd Isotope ◽  
Granite Terrain

Plagioclase weathering by mycorrhizal plants in a Ca-depleted catchment, inferred from Nd isotope ratios and REE composition

2017 ◽  
Vol 51 (6) ◽  
pp. 537-550
Author(s):  
Tasuku Akagi ◽  
Tomohiro Miura ◽  
Rie Takada ◽  
Kazuo Watanabe
Keyword(s):  
Isotope Ratios ◽  
Nd Isotope ◽  
Mycorrhizal Plants

New approaches to crustal evolution studies and the origin of granitic rocks: what can the Lu-Hf and Re-Os isotope systems tell us?

1996 ◽  
Vol 87 (1-2) ◽  
pp. 339-352 ◽  
Author(s):  
Clark M. Johnson ◽  
Steven B. Shirey ◽  
Karin M. Barovich
Keyword(s):  
Continental Crust ◽  
Isotope Ratios ◽  
Granitic Rocks ◽  
Nd Isotope ◽  
Volcanic Arcs ◽  
Depleted Mantle ◽  
Os Isotopes ◽  
Isotope System ◽  
Os Isotope

ABSTRACT:The Lu-Hf and Re-Os isotope systems have been applied sparsely to elucidate the origin of granites, intracrustal processes and the evolution of the continental crust. The presence or absence of garnet as a residual phase during partial melting will strongly influence Lu/Hf partitioning, making the Lu–Hf isotope system exceptionally sensitive to evaluating the role of garnet during intracrustal differentiation processes. Mid-Proterozoic (1·1–1·5Ga ) ‘anorogenic’ granites from the western U.S.A. appear to have anomalously high εHf values, relative to their εNd values, compared with Precambrian orogenic granites from several continents. The Hf-Nd isotope variations for Precambrian orogenic granites are well explained by melting processes that are ultimately tied to garnet-bearing sources in the mantle or crust. Residual, garnet-bearing lower and middle crust will evolve to anomalously high εHf values over time and may be the most likely source for later ‘anorogenic’ magmas. When crustal and mantle rocks are viewed together in terms of Hf and Nd isotope compositions, a remarkable mass balance is apparent for at least the outer silicate earth where Precambrian orogenic continental crust is the balance to the high-εHf depleted mantle, and enriched lithospheric mantle is the balance to the low-εHf depleted mantle.Although the continental crust has been envisioned to have exceptionally high Re/Os ratios and very radiogenic Os isotope compositions, new data obtained on magnetite mineral separates suggest that some parts of the Precambrian continental crust are relatively Os-rich and non-radiogenic. It remains unclear how continental crust may obtain non-radiogenic Os isotope ratios, and these results have important implications for Re-Os isotope evolution models. In contrast, Phanerozoic batholiths and volcanic arcs that are built on young mafic lower crust may have exceptionally radiogenic Os isotope ratios. These results highlight the unique ability of Os isotopes to identify young mafic crustal components in orogenic magmas that are essentially undetectable using other isotope systems such as O, Sr, Nd and Pb.

Zircon U-Pb ages, geochemistry, and Sr-Nd isotope ratios for early cretaceous magmatic rocks, southern Saqqez, northwestern Iran

Geochemistry ◽  
2020 ◽  
pp. 125687
Author(s):  
Somayeh Gholipour ◽  
Hossein Azizi ◽  
Fariborz Masoudi ◽  
Yoshihiro Asahara ◽  
Motohiro Tsuboi
Keyword(s):  
Early Cretaceous ◽  
Isotope Ratios ◽  
Nd Isotope ◽  
Magmatic Rocks ◽  
Northwestern Iran

scholarly journals Sr and Nd isotope ratios and REE abundances of moraines in the mountain areas surrounding the Taklimakan Desert, NW China.

2000 ◽  
Vol 34 (6) ◽  
pp. 407-427 ◽  
Author(s):  
Qing Chang ◽  
Takashi Mishima ◽  
Sadayo Yabuki ◽  
Yoshio Takahashi ◽  
Hiroshi Shimizu
Keyword(s):  
Isotope Ratios ◽  
Taklimakan Desert ◽  
Mountain Areas ◽  
Nd Isotope ◽  
Nw China ◽  
The Taklimakan Desert

scholarly journals U-Pb zircon ages and Sr and Nd isotope compositions of the Soeda Granodiorite, northern Kyushu, Southwest Japan

2019 ◽  
Vol 125 (6) ◽  
pp. 405-420
Author(s):  
Masaki Yuhara ◽  
Atsushi Kamei ◽  
Yoshinobu Kawano ◽  
Osamu Okano ◽  
Yasutaka Hayasaka ◽  
...  
Keyword(s):  
Southwest Japan ◽  
Nd Isotope

scholarly journals Climate induced temporal change in Sr-Nd isotope ratios in the valley-fill deposits of the Ganga river

2014 ◽  
Vol 48 (5) ◽  
pp. 451-462 ◽  
Author(s):  
SHAILESH AGRAWAL ◽  
PRASANTA SANYAL ◽  
SRINIVASAN BALAKRISHNAN ◽  
JITENDRA K. DASH
Keyword(s):  
Temporal Change ◽  
Isotope Ratios ◽  
Ganga River ◽  
Nd Isotope ◽  
Valley Fill
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