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1.3 Troodos Ophiolite (6.1 Megapillows (Texture (Edges - columnar jointing…
1.3 Troodos Ophiolite
6.1 Megapillows
A variety of volcanic landforms result from pillow lava activity
Nest of lava pillows/ feeder tubes on seafloor
Form where dykes approach seafloor
but do not burst
Texture
Edges - columnar jointing
cool slowly toward surface
Rubbly centre
Essentially
big propagating tubes of lava erupt onto seafloor
Lense shaped megapillow
Lava flow
= into/out of outcrop (NE or SW?)
6.2
Dykes intersecting
Why does big intrusion thicken moving E ?
Big horizontal igneous body - could be sill or dyke ?
Flow?
May be a flow given it thickens moving E
Flows might thicken on reaching a depression
Why might there be a depression?
Flow might abut against a graben
Faulting evidence
Dipping dyke - taking advantages of weaknesses around fault?
Faulting supported by 45° dipping dyke
Offset btwn 2 dyke sections - same dyke offset ?
Interp
Punctuated periods
Volcanics - dykes - sheetflows
Malounda Bridge & Kamaropotamos Canyon