Hi all, I have a question here and expect your opinions:
For the modern global subduction zones, some subduction zones are characterized by slab with thick carbonate-rich sedimenatry layers, e.g., Central America and Columbia-Peru subduction zones. While some others are featured by carbonate-poor sedimenatry layers. Just wondering, with time going back through Archean, what is the distribution pattern of seafloor sedimentary carbonate throgh time, and will subduction zones be associated with carbonate-rich or carbonate-poor sedimentary layers? Based on the ophiolite evidence, sedimentary sequences associated with older ophiolites (say, early than Juassic) are lack in carbonate; while later on, carbonate can be seen in sedimets associated with ophiolite. All this is related to the deposition of carbonate on the seafloor through geological time. I am wondering is there any geochemical proxy (or some other proxies) that I can use to extrapolate the relative quantity of deposited sedimentary carbonate in the seaflloor through geological time?
What about the
Carbonate Analogs Through Time (CATT)
Hypothesis ?
There are numerous papers and presentations
H.G.Dill
Dear Harald
I offer two works for your question
1- Li et al., 2015
https://www.nature.com/articles/srep11547
2- Plank and Manning, 2019
https://www.nature.com/articles/s41598-019-52821-2
Regards
Massih
Dear Kan Li: I don't believe there is any relation between carbonate pelagites and subduction zones! There are actually subduction zones in every possible marine environment, from diatom and radiolarian loaded pelagites in the Aleutian trench, to carbonate forams in the Peruvian trench, and so on. It is the temperature, salinity and depth (CCD) of the ocean on top of the oceanic lithosphere being subducted what regulates the presence of carbonatic vs. siliceous pelagic clays. Also, going back to Archean oceanic carbonatic deposition is far fledged as, if any, different organisms -many unknown- existed then, and actually even in Mesozoic and Paleozoic times!
Regards, Sebastian.
Dear Kan Li, please see the talk given by Kristin Bergmann as a AAPG distinguished lecture. He has mentioned carbonate sedimentation through geological history, including the relationship between seafloor carbonate with subduction zones.
It depends on the source area that feeds the trench with sediments, if the trench close to continental arcs ( or block), it supplied by both carbonates and siliciclastic sediments( volcanic detritus and greywackes. but when close to oceanic island arc it feeds predominantly with volcanic detritus and greywackes. When the basin small it may be supplied from both sides (continental block and island arc) of the basin see Neo-tethys ocean during early cretaceous drawn by me
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