Guo et al. (2009) Mineralogical and geochemical constraints on magmatic evolution of Paleocene adakitic andesites from the Yanji area, NE China, Lithos, 112, 321-341, doi:10.1016/j.lithos.2009.03.017. < 20100403102547580.admin > pub

Map on Earth or stone. Places and analyses are shown.

  • abstract:

    Paleocene (55–58 Ma) adakitic andesites from the Yanji area of NE China are subdivided into clinopyroxene andesites and amphibole andesites. Relative to the clinopyroxene andesites, the amphibole andesites contain higher SiO2, K2O and lower MgO, FeOT, Al2O3, CaO, TiO2, Cr, Ni, Sr, Y and Nb, and have evolved Sr–Nd–Pb isotope compositions. Compositional variation between the clinopyroxene andesites and amphibole andesites involves systematic decreases in MgO, Sr/Nd and εNd(t) accompanied by increases in 87Sr/86Sr(i) and 206Pb/204Pb(i), and suggests a role for crustal contamination. The compositional variations recorded in clinopyroxene and amphibole phenocrysts indicate that the primary mantle-derived adakitic magma experienced complex crustal-level processes, including magma mixing, fractional crystallization and crustal contamination or assimilation. The low Na2O contents and adakitic trace element features (high Sr/Y and Nd/Yb) in Mg-rich parts of clinopyroxene phenocrysts, and negative Sr and Eu anomalies in the Fe-rich clinopyroxene cores, suggest that all clinopyroxenes crystallized in equilibrium with little or no garnet, and argues against magmatic evolution involving differentiation of basaltic magmas. Combined mineralogical and geochemical data indicate that the clinopyroxene andesites were generated by magma mixing, clinopyroxene fractionation and limited degrees of crustal assimilation; whereas the amphibole andesites underwent magma mixing, fractionation of clinopyroxene + amphibole +/− plagioclase and higher degree of crustal assimilation. The difference in mineralogical assemblage between the two rock types was influenced by magma temperature, i.e., 900–950°C for the amphibole andesites and > 950°C for the clinopyroxene andesites. Our results provide the following important constraints on high-MgO adakitic magma (or low-SiO2 adakite) petrogenesis: (1) the primary magma of such adakites is probably produced through melting of slab melt-modified mantle rather than being a slab melt variably hybridized by peridotite: (2) The complex magmatic evolution recorded in the Yanji adakitic andesites suggests that such adakitic rocks are far from melts in equilibrium with mantle, and magmatic process needs to be carefully examined before the petrogenetic or geodynamic significance can be assessed: (3) The perquisites for creating high-MgO or low-SiO2 adakites include slab melt–mantle interaction during oceanic slab subduction and melting of this metasomatized mantle, but this melting event need not necessarily be related in time to the subduction event.

  • doi: 10.1016/j.lithos.2009.03.017
  • modified at 1 h ago
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(a) EPMA on EPMA
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(a) EPMA on EPMA
(b) SIMS on SIMS Cameca ims-5f
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(a) EPMA on EPMA
(b) SIMS on SIMS Cameca ims-5f
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(a) ICPMS on ICPMS
(b) TIMS on TIMS Thermo-Fisher MAT262
1: 05YJ-63 2: 05YJ-64 3: 05YJ-65 4: 20YJ-127 5: 20YJ-132 6: 20YJ-134 7: 20YJ-139


(a) XRF on XRF Rigaku RIX300
(b) ICPMS on ICPMS
Tixhr 473621625 thumb 05YJ-63 < 20180221144605-000474 >pub
  • classification: volcanic:andesitic
  • physical-form: on mount
  • status: (unknown)
  • description: Yanji area; clinopyroxene andesite
  • modified at 2020-05-11
Tixhr 1707109765 thumb 05YJ-64 < 20180221144732-250970 >pub
  • classification: volcanic:andesitic
  • physical-form: on mount
  • status: (unknown)
  • description: Yanji area; clinopyroxene andesite
  • modified at 2020-05-11
Tixhr 1043173009 thumb 05YJ-65 < 20180222105303-219116 >pub
  • classification: volcanic:andesitic
  • physical-form: on mount
  • status: (unknown)
  • description: Yanji area; clinopyroxene andesite
  • modified at 2020-05-11
Tixhr1079472628 thumb 20YJ-139 < 20180221144435-873096 >pub
  • classification: volcanic:andesitic
  • physical-form: on mount
  • status: (unknown)
  • description: Yanji area; amphibole andesite
  • modified at 2020-05-11
Tixhr450065924 thumb 20YJ-134 < 20180221105003-393496 >pub
  • classification: volcanic:andesitic
  • physical-form: on mount
  • status: (unknown)
  • description: Yanji area; amphibole andesite
  • modified at 2020-05-11
Tixhr 879781612 thumb 20YJ-127 < 20180221104751-759532 >pub
  • classification: volcanic:andesitic
  • physical-form: on mount
  • status: (unknown)
  • description: Yanji area; amphibole andesite
  • modified at 2020-05-11
Tixhr 1315695777 thumb 20YJ-132 < 20180221104858-316653 >pub
  • classification: volcanic:andesitic
  • physical-form: on mount
  • status: (unknown)
  • description: Yanji area; amphibole andesite
  • modified at 2020-05-11
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name spots global-id
caption ID rowname stone
Appended Table 2 Representative electron microprobe analyses of plagiolcase in the amphibole andesites in the Yanji area pub 20200123114708-343622 major_Pl (Guo et al., 2009) 17
Appended Table 1 Representative electron microprobe and ion microprobe analyses of clinopyroxene in both types of andesites from the Yanji area pub 20200123105604-801577 major-trace_Cpx (Guo et al., 2009) 25
Table 1. Representative major and trace element compositions of amphibole pub 20200122103325-684238 major-trace-Amp (Guo et al., 2009) 32
Table 3. Sr–Nd–Pb isotopic compositions of Paleocene adakitic andesites from the Yanji area, NE China pub 20200122121127-424750 Sr-Nd-Pb-isotopes (Guo et al., 2009) 7
Table 2. Representative major (wt.%) and trace element (ppm) compositions of Paleocene adakitic andesites from the Yanji area, NE China pub 20200122113256-344730 major-trace-WR (Guo et al., 2009) 7
manual
  • name
  • Guo, F.
  • Nakamura, E.
  • Fan, W.
  • Kobayashi, Katsura
  • Li, C.
  • Gao, X.