Aluminium saturation in I- and S-type granites and the characterization of fractionated haplogranites

Chappell, B. W.

doi:10.1016/s0024-4937(98)00086-3

Cited by 1,165 publications

(576 citation statements)

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“…Although the biotite granites are peraluminous (ASI=1.05-1.33), they have low P 2 O 5 contents (<0.14%) that distinguish them from the S-type granite. Furthermore, P 2 O 5 and SiO 2 scatter plot shown in Figure 5 indicates that these data form a clear negative correlation, are consistent with Harrison and Watson's (HW) modal, and fall within the evoloving trendline of the I-type granites, which are diagnostic features of I-type granites [1,7,35]. Wu et al [3] have proposed that petrographic observation…”

Section: Petrogenetic Type and Petrogenesissupporting

confidence: 69%

“…Consequently, there are important difficulties when attempting to propose the petrogenetic schemes of such rocks [1][2][3]. Longyuanba Yanshanian granites are highly siliceous (SiO 2 >70%) and high in Rb/Sr ratios (2.5-19.4), and show significant Eu negative anomalies (δEu =0.02-0.41), suggesting that these rocks may have undergone intense fractionation.…”

Section: Petrogenetic Type and Petrogenesismentioning

confidence: 99%

“…Therefore, most of highly evoloved granites demonstrate the prevailing geochemical features of S-type granites. As a result, the identification of the source rocks of highly evoloved granites will be difficult in petrological investigations, i.e., it is either I-type granites derived from partial melting of preexisting igeous rocks or S-type granites from partial melting of preexisting sedimentary rocks [1][2][3].…”

mentioning

confidence: 99%

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Petrogenesis of early Yanshanian highly evolved granites in the Longyuanba area, southern Jiangxi Province: Evidence from zircon U-Pb dating, Hf-O isotope and whole-rock geochemistry

Tao

et al. 2013

Sci. China Earth Sci.

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Early Yanshanian (Jurassic) granitoids are widespread in the Nanling Range, South China. Whereas large granitic batholiths commonly crop out in the center of the Nanling Range (corresponding geographically to the central and northern parts of Guangdong Province), many small stocks occur in the southern part of Jiangxi Province. Most of the small stocks are associated closely with economically significant rare-metal deposits (W, Sn, Nb, Ta). Here we report the results for biotite granites and two-mica granites from three Yanshanian stocks of the Longyuanba complex. LA-ICPMS U-Pb dating of zircon yields an age of 156.1±2.1 Ma for Xiaomubei biotite granite, and U-Pb zircon dating using SIMS yields an age of 156.7±1.2 Ma for Longyuanba-Chengjiang biotite granite and 156.4±1.3 Ma for Jiangtoudong two-mica granite. Biotite granites are silica-rich (SiO 2 =70%-79%), potassic (K 2 O/Na 2 O>1.9), and peraluminous (ASI=1.05-1.33). Associated samples are invariably enriched in Rb, Th, Pb and LREE, yet depleted in Ba, Nb, Sr, P and Ti, and their REE pattern shows a large fractionation between LREE and HREE ((La/Yb) N =10.7-13.5) and a pronounced Eu negative anomaly (δEu=0.28-0.41). Two-mica granite samples are also silica-rich (SiO 2 =75%-79%), potassic (K 2 O/Na 2 O>1.2), and peraluminous (ASI=1.09-1.17). However, in contrast to the biotite granites, they are more enriched in Rb, Th, Pb and extremely depleted in Ba, Nb, Sr, P and Ti, and exhibit nearly flat ((La/Yb) N =0.75-1.08) chondrite-normalized REE patterns characterized by strong Eu depletion (δEu=0.02-0.04) and clear tetrad effect (TE 1.3 =1.10-1.14). Biotite granites and two-mica granties have comparable Nd isotopic signatures, and their εNd(t) are concentrated in the 13.0 to 9.6 and 11.5 to 7.7 respectively. Their zircon Hf-O isotopes of both also show similarity (biotite granites: εHf(t)=10.8-7.9, δ 18 O=7.98‰-8.89‰ and εHf(t)= 13.8 to 9.1, δ 18 O=8.31‰-10.08‰; two-mica granites: εHf(t)=11.3 to 8.0, δ 18 O=7.91‰-9.77‰). The results show that both biotite and two-mica granites were derived mainly from sedimentary source rocks with a minor contribution from mantle-derived materials. In spite of some S-type characteristics, the biotite granites were formed by fractional crystallization of I-type magma and assimilation of peraluminous sedimentary rocks during their ascent to the surface. Therefore, they belong to highly fractionated I-type granites. Two-mica granites exhibit a tetrad effect in their REE patterns, but share the same isotopic features with the biotite granites, suggesting that they are highly fractionated I-type granites as well. Their Lanthanide tetrad effects may be attributed to the hydrothermal alteration by magmatic fluids that have suffered degassing at late stages. Granitic magmas undergoing fractional crystallization and wall-rock assilimation can generate highly evolved granites with no REE tetrad effect in the uni-phase system. However, in the late-stage of magmatic evolution in the multi-phase system (i.e., magmatic-hydrothermal s...

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Section: Petrogenetic Type and Petrogenesissupporting

confidence: 69%

Section: Petrogenetic Type and Petrogenesismentioning

confidence: 99%

mentioning

confidence: 99%

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Petrogenesis of early Yanshanian highly evolved granites in the Longyuanba area, southern Jiangxi Province: Evidence from zircon U-Pb dating, Hf-O isotope and whole-rock geochemistry

Tao

et al. 2013

Sci. China Earth Sci.

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“…The negative correlation between P 2 O 5 and SiO 2 thus indicates A B that the TSM syenogranites are I-type granites ( Fig. 5F; Chappell, 1999;Wu et al, 2003). Previous studies classify the rocks from the Taishanmiao pluton as Atype granites (Ye et al, 2008).…”

Section: Genetic Typementioning

confidence: 83%

“…6B;Chappell, 1999). Negative Nb, Ta and Ti anomalies are considered to have resulted from fractionation of Tibearing phases, and negative P anomalies from apatite separation.…”

Section: Petrogenesismentioning

confidence: 99%

Petrogenesis of the early Cretaceous intermediate and felsic intrusions at the southern margin of the North China Craton: Implications for crust–mantle interaction

Gao¹,

Zhao²,

Bao³

et al. 2014

Lithos

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Trace elements in quartz shed light on sediment provenance

Ackerson

Tailby

Watson

2015

Geochem Geophys Geosyst

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Quartz is one of the most common minerals on the surface of the earth, and is a primary rockforming mineral across the rock cycle. These two factors make quartz an obvious target for sediment provenance studies. Observations from experimental and natural samples demonstrate that the trace element content of quartz often reflects the conditions of quartz formation. When quartz is weathered from its primary crystallization setting (i.e., quartz from a granitoid) it can retain many chemical signatures of formation throughout the sedimentation processes. These geochemical signatures can be used to understand the primary source of individual quartz grains within a sediment. Here we present a case study from the Bega River catchment to demonstrate that quartz grains in sediments at the mouth of the Bega River are sourced from granitoids within the drainage basin. Data presented here also indicate that a portion of the beach sediment is also derived from either (i) sedimentary rocks within the basin or; (ii) mixing with sediments at the mouth of the river. The Bega River catchment was selected for this study because it is both small and has a wellconstrained bedrock lithology, making it an ideal location to test the utility of this provenance technique. However, quartz trace element provenance has broad applications to modern and ancient sediments and can be used in lieu of, or in conjunction with, other provenance techniques to elucidate sediment transport through time.

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Aluminium saturation in I- and S-type granites and the characterization of fractionated haplogranites

Cited by 1,165 publications

References 24 publications

Petrogenesis of early Yanshanian highly evolved granites in the Longyuanba area, southern Jiangxi Province: Evidence from zircon U-Pb dating, Hf-O isotope and whole-rock geochemistry

Petrogenesis of early Yanshanian highly evolved granites in the Longyuanba area, southern Jiangxi Province: Evidence from zircon U-Pb dating, Hf-O isotope and whole-rock geochemistry

Petrogenesis of the early Cretaceous intermediate and felsic intrusions at the southern margin of the North China Craton: Implications for crust–mantle interaction

Trace elements in quartz shed light on sediment provenance

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