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Table 1
List of mid-ocean ridges showing unusual crustal accretion characteristics
Spreading
full-rate
(cm/year)
Robust
magmatic region
Cold mantle
domain
Multiple
FZ
Occurrence
of OCC
Degree of
mantle melting
Inferred
mechanism
References for
spreading rate
Location name
Parece Vela Basin
Chaotic Terrain
8.8
Ye s
Ye s
No
Ye s
Moderate
Magmatic + cold
mantle
Okino et al.
(
1998
)
Central PVB
7.0
Ye s
No
Ye s
Ye s
Low
Magmatic + TSE
Ohara et al.
(
2001
)
Mid-Atlantic Ridge
Ascension
3.3
Ye s
No
Ye s
Ye s
Relatively low
Magmatic + TSE
Bruguier et al.
(
2003
)
a
St. Paul
3.2
No
Ye s
Ye s
Smooth
seafloor
Low
Cold mantle + TSE
DeMets et al.
(
1994
)
Southeast Indian
Ridge
AAD
7.2
Ye s
Ye s
No
Ye s
Relatively low
Magmatic + cold
mantle
Okino et al.
(
2004
)
a
Chile Ridge
Valdivia
6.2
b
Ye s
No
Ye s
Ye s
Relatively low
Magmatic + TSE
Tebbens et al.
(
1997
)
East Pacific Rise
Garret
14.5
Ye s
No
Leaky
type
No
High
-
Naar and Hey
(
1989
)
Siqueiros
10.7
Ye s
No
Leaky
type
No
High
-
Pockalny et al.
(
1997
)
TSE
transform sandwich effect
a
Based on NUVEL-1A (DeMets et al.
1994
)
b
Postulated rate; originally appeared as half-rate in the reference
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