UK IODP Newsletter March 2022

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ED

147° E

148° E

75

Conical Cerulean Pacman NE Quaker Quaker E Quaker Baby Blue

Conical

Mariana Trench

Agrihan Pagan

Yinazao

pH = 12.5

pH = 12.5

pH = 12.5

pH = 11.0

pH = 11.2

B Ca Na K

B Ca Na K

B Ca Na K

B Ca Na K

B Ca Na K

Dip-slip motion Horizontal motion (toward) Horizontal motion (away) Serpentine mud volcano

K, CO2– Na, SO2– , 3 , 4 Carbonate B, Rb, Cs

U1496 U1495 Asut 18° N U1494 Tesoro U1493 Alamagan

Ca, Sr, Rb, Cs, Ba

chimneys

Forearc sediment

Horst block

Guguan

Conduit of mud volcano Greenschist pod Blueschist pod

Ca, Sr, Cs, Ce Brucite chimneys

Fantangisna

16° N

Farallon de Medinilla

Mariana Trench

Anatahan

Forearc mantle

U1497 U1498

U1492 U1491

Serpentinisation reactions

Yinazao

Saipan

4H2 + CO32- = CH4 + H2O + 2OHDecollement

14° N

South Chamorro 10,000

8,000

6,000 4,000 Depth (m)

Sampled Mud Volcano

2,000

0

IODP 366 Drill site

=4%!^3&;$(3#8!'(!+,#!=$/'$($!C/#(;,! $(%! GA.#%'+'3(! <JJ! %/'&&! 8'+#8!

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ist ch es u l B

Trench axis

Pacific plate seamount

0

Horst block lyite pel m u te-P hni Pre

Graben Sarigan

0

Distance from trench axis (km)

South Chamorro Asùt Tesoru Fantangisña

sediment compaction & C 80° Opal CT dehydration @ <80 °C t < s chi ens e r C G ° 80 C– 0° clay diagenesis & 0 2 desorbed water release @ ~125 °C

°C carbonate breakdown & 50 <2 Lawsonite Epidote @ >250 °C

Lawsonite + Ca2+ + Na2O (cpx) = Epidote + 5H2O + 2Na+

n

5

Depth (km)

146° E

10

15

ing as ing e r n n nc e tio y i sh uc nit Fre i l d a id b su Alk Flu of n tio ec Dir

20

25

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