Cryogenian magmatic activity and early life evolution.

Area of Science:

• Geoscience
• Paleontology
• Geochemistry

Background:

• The Cryogenian period (720-635 million years ago) experienced significant magmatic-volcanic events, potentially influencing early life.
• The Qinling Orogenic Belt provides a unique geological record of this era.

Purpose of the Study:

• To investigate the geochemical composition of Cryogenian volcanic rocks.
• To determine the impact of volcanic activity on oceanic nutrient flux and early life evolution.

Main Methods:

• Geochemical analysis of volcanic strata from the Yaolinghe group.
• Comparison of elemental concentrations with average felsic volcanics and contemporaneous tillite.

Main Results:

• Cryogenian volcanics are enriched in trace elements (Co, Cr, Bi, Ni, Se, Ga, As, Cu, Ba, V, Zn) compared to average felsic rocks.
• Elemental concentrations (P, Cd, Co, Ni, Se) in volcanics are significantly higher than in the Liantuo tillite.
• Volcanic rocks indicate formation in an active island arc setting.

Conclusions:

• Cryogenian magmatic and volcanic activity substantially increased oceanic trace nutrient flux.
• This nutrient enrichment likely supported the accelerated evolution of early life observed in the Ediacaran period.