Zn-Rich Spinel in Association with Quartz in the Al-Rich

Al-rich metapelites from the Mashan khondalite series are characterized by the assemblage Spl+Grt+Sil+Crd+Bt+Pl (An₇₂)+Kfs+Quartz+graphite. Large amounts of spinel+quartz assemblages occur as inclusions in garnet and prismatic sillimanite in the Al-rich metapelites of the Mashan complex, NE China. The chemical composition of spinel is characterized by Zn-rich (<i>X</i>_Zn=0.33–0.40. <i>X</i>_Zn=Zn/Zn+Mg+Fe*) (Fe*=Fe²⁺+Fe³⁺) and Fe³⁺ rich (up to 0.31 p.f.u.). The characteristic chemical composition and the mineral association indicated that the formation of spinel and quartz assemblage may be due to the breakdown of Zn-rich staurolite. The geothermobarometers studies show that the peak temperature of the Mashan complex is around 820 ℃ and the peak pressures is 8.0 kbar. The Mashan complex shows a typical orogen style <i>P</i>-<i>T</i> path.

Calculated s 2 -X relations for MgAl 2 O 4 -Al 8/3 O 4 spinels (T 2200

PDF) Zn-Rich Spinel in Association with Quartz in the Al-Rich Metapelites from the Mashan Khondalite Series, NE China

Photomicrographs of: (a) Zincian-staurolite (St) with inclusions of

Zn-Rich Spinel in Association with Quartz in the Al-Rich Metapelites from the Mashan Khondalite Series, NE China

Rich Burmese Red Spinel. Hard to Find Pair, Baguette Cut, 1.75 ct. pai - MdMaya Gems

Zn-Rich Spinel in Association with Quartz in the Al-Rich Metapelites from the Mashan Khondalite Series, NE China

a) Photomicrograph of large cordierite porphyroblast enclosing relics

Photomicrographs of the studied rocks. (a) Corundum-rich rock (L1)

Spinel: Mineral information, data and localities.

Zn-Rich Spinel in Association with Quartz in the Al-Rich Metapelites from the Mashan Khondalite Series, NE China

PDF) Zn-Rich Spinel in Association with Quartz in the Al-Rich Metapelites from the Mashan Khondalite Series, NE China

Spinel Mineral Properties, Formation, Occurrence and Uses » Geology Science

Triangular diagram in terms of molar proportions of Al 2 O 3 , MgO and

Relationships between Cr/(Cr + Al) atomic ratio and Mg#, and Cr-Al-Fe

Spinel: Mineral information, data and localities.