Peri-equatorial paleolatitudes for Jurassic radiolarian cherts of Greece

Global Distribution of Rhaetian Radiolarian Faunas and Their Contribution to the Definition of the Triassic-jurassic Boundary

. Kojima, S., 1989, Mesozoic terrane accretion in Northeast China, SikhkoteAlin and Japan regions: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 69, p. 213-232. Kojima, S. and Mizutani, S., 1987. Triassic and Jurassic Radiolaria from the Nadanhada Range, Northeast China: Transactions and Proceedings Palaeontological Society of Japan, 148, p. 256-275. Kozur, H., 1984a, New radiolarian ta...

Radiolarian tests as microhabitats for novel benthic foraminifera_ Observations from the abyssal eastern equatorial pacific (clarion–Clipperton fracture zone)

Biogeochemical signatures preserved in ancient siliceous sediments; new perspectives to Triassic radiolarian bedded chert compositions

Major and minor elements of successively collected 70 Middle Triassic radiolarian bedded cherts from the Mino Belt in central Japan were studied. In order to reveal pre-diagenetic, primary geochemical signatures related to marine biogeochemical cycles, composite data of chert-shale couplets in addition to raw data were examined. The results show that Mn, Cu, Sr, Ba and P were supplied significa...

Si isotope variability in Proterozoic cherts

We report Si-isotopic compositions of 75 sedimentologically and petrographically characterized chert samples with ages ranging from 2600 to 750 Ma using multi-collector inductively coupled plasma mass spectrometry. dSi values of the cherts analyzed in this study show a 7& range, from 4.29 to +2.85. This variability can be explained in part by (1) simple mixing of silica derived from continental...

Geologic consequences of globe-encircling equatorial currents

Many black shales, phosphorites, and cherts that formed at low paleolatitudes on the North American continent during the late Paleozoic were a direct consequence of equatorial upwelling and an equatorial undercurrent in an ocean that spanned much of the globe. In equatorial parts of modern oceans, wind stress divergence leads to high surface productivity. Sinking organic matter is remineralized...