James Ross Island Volcanic Group
The James Ross Island Volcanic Group is a stratigraphic unit of Cenozoic age distributed on James Ross Island and Vega Island of the James Ross Island group, the Tabarin and Trinity peninsulas of Graham Land and surrounding islands in the Prince Gustav and Antarctic sounds.

The volcanic group consists predominantly of alkali basalts with minor hawaiites, benmoreites and mugearites. They are interpreted to have been deposited by volcanic eruptions in an extensional back-arc setting after subduction had ceased along the western margin of the Antarctic Peninsula. K–Ar dating of these rocks suggest that they were erupted from about 7 million years ago up until about a few hundred thousand years ago. However, volcanic rocks as young as only a few thousand years old may exist on James Ross Island.

Rocks of the James Ross Island Volcanic Group comprise Surtseyan tuff cones and Strombolian cinder cones, as well as lava deltas and overlying subaerial lava flows. The dominating feature of the James Ross Island Volcanic Group is Mount Haddington, a massive shield volcano of Miocene-to-Pliocene age on James Ross Island.
Q3694119
stratigraphic unit
Concept
Q102416
Cenozoic
TIME
Q1022143
James Ross Island
LOC
Q1241818
Vega Island
LOC
Q6142460
James Ross Island group
LOC
Q2680422
Tabarin
LOC
Q2038835
Trinity
LOC
Q618370
Graham Land
LOC
Q141056
Prince Gustav
LOC
Q571127
Antarctic
LOC
Q2895674
volcanic group
Concept
Q4727640
alkali basalt
Concept
Q628656
hawaiite
Concept
Q4889587
benmoreite
UNK
Q627005
mugearite
Concept
Q2213536
extensional
Concept
Q798367
back-arc
Concept
Q176318
subduction
Concept
Q185605
Antarctic Peninsula
LOC
Q1068405
K–Ar dating
Concept
Q108689
volcanic rock
Concept
Q1060842
Surtseyan
Concept
Q1368970
tuff cone
Concept
Q611880
Strombolian
Concept
Q1806785
cinder cone
Concept
Q3021926
lava delta
UNK
Q3302073
Mount Haddington
LOC
Q212057
shield volcano
Concept
Q76267
Miocene
TIME
Q76259
Pliocene
MEDIA
Q96384153
James Ross Island Volcanic Group
UNK
Q96384153
James Ross Island Volcanic Group
UNK
Q96384153
James Ross Island Volcanic Group
UNK
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NUMBER
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