The Permian (similar to 260 Ma) Emeishan large igneous province of SW China contains three nearly identical gabbro-granitoid complexes that host giant Fe-Ti oxide deposits. The Fe-Ti oxide deposits are within the lower portions of evolved layered gabbroic intrusions and are spatially and temporally associated with A-type granitic plutons. The 264 +/- 3 Ma Taihe layered gabbroic intrusion hosts a large magmatic Fe-Ti oxide deposit and is coeval with the Taihe peralkaline, A-type granitic pluton, which is dated at 261 +/- 2 Ma. Within the A-type granitic pluton are microgranular enclaves, which have compositions intermediate between the gabbro and host granite. Primitive mantle-normalized incompatible element plots show corresponding reciprocal patterns between the mafic and felsic rocks. The chondrite-normafized REE patterns show Eu-anomalies changing from positive (Eu/Eu* = 1.5 to 5.9) in the gabbroic intrusion to negative in the enclaves (Eu/Eu* = 0.4 to 0.6) and granites (Eu/Eu* = 0.2 to 0.5). Whole rock epsilon Nd-(T) values of the gabbroic intrusion (epsilon Nd-(T) = +2.5 to +3.3) are similar to those of the enclaves (epsilon Nd-(T) = +1.0 to 2.0) and granite (epsilon Nd-(T) = +1.5 to +1.9) whereas the zircon epsilon Hf-(T) values of the gabbro (epsilon Hf-(T) = +8.1 +/- 0.8) are indistinguishable from those of the granites (epsilon Hf-(T) = +9.2 +/- 1.0), suggesting that the parent magmas for all rock types originated from the same mantle source. Geochemical modeling indicates that the gabbros and granites can be generated by fractional crystallization of a common parental magma similar to high-Ti Emeishan flood basalt. The compositional jump from the gabbro to the enclaves is attributed to the crystallization of Fe-Ti oxide minerals. The results of this study and other studies suggest that the magmatic conditions (for example, pressure, composition, fO(2)), which led to the formation of at least three Fe-Ti oxide bearing gabbro-granitoid complexes, were relatively common during the development of the Emeishan large igneous province.

Publication name	AMERICAN JOURNAL OF SCIENCE　Volume: 311 　Issue: 9 　Pages: 773-812 　DOI: 10.2475/09.2011.02 　Published: NOV 2011
Author(s)	Shellnutt, J. Gregory; Wang, Kuo-Lung; Zellmer, Georg F.; Iizuka, Yoshiyuki; Jahn, Bor-Ming; Pang, Kwan-Nang; Qi, Liang; Zhou, Mei-Fu
Corresponding author	Shellnutt, JG  jgshelln@ntnu.edu.tw  Natl Taiwan Normal Univ, Dept Earth Sci, 88 Tingzhou Rd,Sect 4, Taipei 11677, Taiwan
Author(s) from IGCAS	QI Liang

View here for the details from the publisher