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10.1 South Troodos Yerasa F & T Belt (Moni Clay interpretation (Blocks…
10.1
South Troodos Yerasa F & T Belt
Yerasa Fold & Thrust Belt
Oligocene
= Localised zone of shortening (Thrusting assoc w collision)
Which thrust Troodos southward over Moni Melange in U. Cretaceous
Reflects initiation of N dipping subduction under Cyprus
U. Cretaceous Tectonics
Tectonics assoc w 'docking of Troodos'
--> with Mesozoic Mammonia passive margin
Generated distinctive
Moni Melange
with huge Mesozoic blocks in it
Moni clay
Clay w floating blocks
Extends E & S
Equivalent to Petro Rominau
Upper Pillow
Bonninitic signature
Rubbly, brecciated pillow lava blocks
Umbers infill space btwn pillow blocks
Tectonic melange formation
Olistoliths --> big blocks
Not normal (allochthonous)
Tectonically emplaced
Pull apart sstone
--> clay squeezes in btwn blocks
Sstone locks broke off margin & fell by gravity current
Clay injected during sstone breakup
(evidence: interbedding of 2)
Clay = v scaly
Clay acts as a lubricant, aiding breakup of sstone.
suggests expansion / contraction
Supports water-rich clay injects during tectonic events
Parakklisia Sstone
E Cretaceous
Poor sorted, m-scale sstone blocks floating in clay matrix
Interp: Grain flow
akin to that seen in E. Cretaceous
Sandstone unit signif
Acts as source for adjacent clay unit
As sand breaks up, clay reinjects space btwn
Highly sheared ssstone unit
Clay w sstone
Sstone = Mammonia margin fragment
Akamas sstone sits in Moni clay
Clay = deep ocean sed
from below CCD
no radiolarite here --> hiatius / sed missing btwn ophiolite & clays?
Sequence
:
Miocene blocks (hiatus)
Clay w sstone
(umber infills pillows)
Pillow Breccia (Troodos volcanics) :
Moni Clay interpretation
Moni clay sits atop Troodos plate
Docking takes place
Blocks detached from Mammonia (above)
sstones ~ E Cretaceous
Block injected into clay due to collision
Collision - deformation - blocks
Shallow water carbonate & volcanogenic blocks injected into clay
Miocene Blocks
Miocene carbonate blocks atop Moni clay outcrop
Transgression
Miocene slither draping over Moni Clay
Blocks in Moni Melange
Akamas Sstone Clast
Outbuilding margin of Mammonia delta
Lobes - prograde out to sea
Channels - high energy part of system
Deltaic shallow water (like Nicosia)
This is a really big deltaic clast picked up by the clay
Sandstone w high angle cross beds, channels
Ancient Triassic seafloor
Deep sea pelagic carbonate
Continental margin
Alkali basalts