Tectonics of Unusual Crustal Accretion in the Parece Vela Basin - Accretionary Prisms and Convergent Margin Tectonics in the Northwest Pacific Basin - page 161

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