Chlorophylls geochemistry

Chlormagnesite, 855 Chlormanganokalite structure, 846 Chlorocruorins, 689 Chloromethylation acetylacetone metal complexes, 205 Chloroperoxidase, 705 Chlorophylls geochemistry, 863 photosynthesis, 590 Chlorosis... 

Composite global images for winter and summer of upper-ocean (a) chlorophyll oonoentrations derived from satellite-based observations of ooean color, (b) computed net primary produotion, and (c) POC export production. Source-. After Falkowski, P. G. (2003). Treatise in Geochemistry, Elsevier, pp. 185-213, (See oompanion website for oolor version.)... 

The problem of the origin of the metal-porphyrins is closely related to that of the origin of petroleum and is oie of the most basic and interesting questions of petroleum geochemistry. The most probable conclusion seems to be that the nickel and vanadium porphyrin complexes are formed by metal exchange reactions from animal and/or plant metabolic pigments such as hemoglobin and chlorophyll. 

This we take as a reasonable premise, given the structural complexity of this class of biomarkers hee Figure 1), and was concluded years ago by the late Professor Alfred Treibs (1-5). However, the development of strong precursor-product relationships in organic geochemistry requires not only statement of plausible end-members (e.g. chlorophyll-a and DPEP-series geoporphyrins) but must include description of the intervening reactions and intermediate structures. 

Sedimentary Chlorophyll Derivatives. In order to unravel the bio-geochemistry of chlorophyll, a variety of depositional environments, each representing potentially different fossilized counterparts, require study. Though the present investigation stresses marine sediments, collected well beneath the photic zone in order to divorce detrital from viable photoautotrophic material, photic zone sapropels and peats have also been examined. 

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