| Citation: |
Li-E Gao, Ling-sen Zeng, Ling-hao Zhao, Jia-hao Gao, Zhen Shang, 2021. Behavior of apatite in granitic melts derived from partial melting of muscovite in metasedimentary sources, China Geology, 4, 44-55. doi: 10.31035/cg2021009
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Behavior of apatite in granitic melts derived from partial melting of muscovite in metasedimentary sources
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Abstract
Fluid-absent and fluid-fluxed melting of muscovite in metasedimentary sources are two types of crustal anatexis to produce the Himalaya Cenozoic leucogranites. Apatite grains separated from melts derived from the two types of parting melting have different geochemical compositions. The leucogranites derived from fluid-fluxed melting have relict apatite grains and magmatic crystallized apatite grains, by contrast, there are only crystallized apatite grains in the leucogranites derived from fluid-absent melting. Moreover, apatite grains crystallized from fluid-fluxed melting of muscovite contain higher Sr, but lower Th and LREE than those from fluid-absent melting of muscovite, which could be controlled by the distribution of partitioning coefficient (DAp/Melt) between apatite and leucogranite. DAp/Melt in granites derived from fluid-absent melting is higher than those from fluid-fluxed melting. So, not only SiO2 and A/CNK, but also types of crustal anatexis are sensitive to trace element partition coefficients for apatite. In addition, due to being not susceptible to alteration, apatite has a high potential to yield information about petrogenetic processes that are invisible at the whole-rock scale and thus is a useful tool as a petrogenetic indicator.
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Keywords:
- Apatite /
- Partitioning coefficient /
- Crustal anatexis /
- Leucogranite /
- Malashan Dome /
- Tethyan Himalaya /
- Geological survey engineering /
- Tibet
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References
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Li-E Gao, Ling-sen Zeng, Ling-hao Zhao, Jia-hao Gao, Zhen Shang, 2021. Behavior of apatite in granitic melts derived from partial melting of muscovite in metasedimentary sources, China Geology, 4, 44-55. doi: 10.31035/cg2021009
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Figure 1.
Simplified geological map of the Himalayan orogenic belt showing the locations of samples. YTS–Yarlung Tsangpo Suture Zone; STDS–southern Tibet Detachment System; MCT–main central thrust; MBT–main boundary thrust; MFT–main frontal thrust.
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Figure 2.
Field photographs of the leucogranites. a, b–leucogranites T0646 and T0658 derived from fluid-fluxed melting of muscovite; and c, d–leucogranites T0655 and T0659-B derived from fluid-absent melting of muscovite.
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Figure 3.
Photomicrographs of the leucogranites and BSE image of apatite, a–c–from the leucogranites derived from fluid-fluxed melting of muscovite, and d–f– from the leucogranites derived from fluid-absent melting of muscovite in metasedimentary sources. Ap–apatite; Bt–biotite; Mus–muscovite; Pl–plagioclase; Qtz–quartz; Tour–tourmaline.
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Figure 4.
Chondrite-normalized rare earth element distribution patterns for apatite from leucogranite. Chondrite normalization values are from Sun SS and McDonough WF (1989). a–c–are from the leucogranites derived from fluid-fluxed melting of muscovite, and d–f–from the leucogranites derived from fluid-absent melting of muscovite.
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Figure 5.
Trace elements characteristics of apatite from leucogranite.
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Figure 6.
Average Sr, Th and LREE relationship in apatite and leucogranite. The dotted lines (a, b) represent the correlation defined by global compilation of whole rock and apatite chemistry in granitoids (Bruand E et al., 2017). T0651 plots away from the correlation, which suggests that T0651 has been altered. Sr has decreased and Th and LREE have increased. Sr=80×10−6, Th=5.5 ×10−6 and ∑LREE=18×10−6. The variation of chemical compositions in T0651 is reasonable given the fractional crystallization of plagioclase rich in anorthite component.
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Figure 7.
Chondrite-normalized rare earth element distribution patterns (a) and PM-normalized trace element spider diagrams (c) for leucogranite and distribution of partitioning coefficient (DAp/Melt) of REE between apatite and leucogranite (b). Primitive mantle and chondrite normalization values are from Sun SS and McDonough WF (1989).
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Figure 8.
Distribution of partitioning coefficient (DAp/Melt) between apatite and leucogranite are sensitive to SiO2, the aluminum saturation index value A/CNK, as well as type of crustal anatexis in leucogranitic magmas.