Timing of leucogranite intrusion and tourmaline alteartion in Zanskar Shear Zone
Both magma intrusion and Qz-Tml alteration can be found as strongly mylonitized by the shear zone, forming layers parallel to the shear plane,
to late, post-kinematic dykes and veins, undeformed and cross-cutting the shear zone.
Qz-Tml Alteration: Syn-kinematic and Post-kinematic
a) Boudinaged quartz vein surrounded by Tml alteration in sheared orthogneiss on Gumbaranjon face.
b) Boudinaged quartz vein surrounded by Tml alteration in sheared orthogneiss on Gumbaranjon face.
c) Post-kinematic Qz-Tml vein altering banded mylonitic orthogneiss with mylonitic leucogranites parallel to shear plane.
Granite Intrusion: Syn-kinematic and Post-kinematic
a) Syn- (pre-?) kinematic Tml-leucogranite, isoclinally folded in Bt-schist.
b) Sheared Gnt-Ms-Tml-Bt leucogranite with sheared K-feldspar porphyroclasts.
c) Mylonitic, Tml-Gt-Ms-Bt leucogranite in normal shear zone (point 33 close to Reru).
e) Post-kinematic leucogranite dykes intruding mylonitic sequence at Gumbaranjon, including
bands of layer-parallel syn-kinematic (pre?) mylonitic leucogranites.
f) Sheared syn-kinematic (pre-?) Ms-Gt-Tml-(Bt?) pegmatitic leucogranite,
intruded by late post-kinematic, Tml-Ms-Gt leucogranite.
g) Post-kinematic, Tml-Ms-Gt leucogranite dykes intruding mylonitic Bt-quartzite (black)
with a layer-parallel band of syn-kinematic (pre?) mylonitic Ms-Gt-Tml-(Bt?) pegmatitic leucogranite.
h) Part of the same block as (c).
i) Textural and temporal variety of post-kinematic leucogranite intrusions.
j) Early, undeformed Tml-leucogranite, with late intrusion of Tml-leucgoranite
with irregular contacts and gradational boundaries: hypothesis, remelting.
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