Fragment Garnet Analysis and Tectonic Evolution of Its Provenance in Late Mesozoic Strata in the Luxi Uplift

Key words: 
• West Shandong uplift /
• tectonic evolution /
• garnet /
• provenance

Abstract: This paper takes Zibo, Linqu, Pingyi, Mengyin basin as the key study  area. Through composition analysis of fragment garnet in Mesozoic sandstone, we try to discuss the tectonic evolution history of West Shandong uplift and the surroundings in Mesozoic. Research shows that garnet composition of Luxi basin changed from Early Mesozoic Jurassic to Midlate Mesozoic Jurassic  implying that  the provenace of Luxi basin shifting. The provenance mainly comed from West Shandong uplift in EarlyMid Jurassic period .Then the provenance turn to Jiaodong region and West Shandong uplift  in Midlate Mesozoic Jurassic period, but the mainly provenance was Jiaodong region. The changes of provenance of garnet in Jurassic Period showed that Sulu Orogen belt was probably uplifted to the earth's surface in Midlate Jurassic. In Cretaceous period the mainly provenance of Luxi basin was Jiaodong area and Luxi uplift had little contribution in provenance supply, but the provenance supply of Luxi uplift shifted in mid Qingshan Formation and midWangshi Formation . In Cretaceous , Sulu Orogen belt controlled the sediment of Luxi Basin. Paleogeography framework indicates that the terrain of Shangdong is higher in the east and lower in the west. The shifts of garnet provenance in Cretaceous showed that West Shandong uplift was probably uplifted in MidLate period in Early Cretaceous and midlate period in Late Cretaceous.