Abstract: At least 5 units of Cretaceous clastic rocks have been found to widely outcrop on the central-northern Lhasa Terrane, Tibet. These sedimentary rocks faithfully encoded information on a series of major geological events such as the demise of Bangong–Nujiang Ocean, the Lhasa-Qiangtang collision, and the early uplift of the Tibetan Plateau. As the Tibetan Plateau has been understudied in geological research, basic petrological data of the Plateau are scarce and not always publicly accesible, which has led to repetitive petrological work. To better share the geological data, we collected polarized light microscopes of 402 pieces of Cretaceous rocks from the five widely outcropping units, namely, Duoni Formation, Duba Formation, Jingzhushan Formation, Daxiong Formation, and Kcv Unit. The rock samples include 23 siltstone, 235 sandstone, 15 conglomerate, 98 gravel, 2 mixed siliciclastic and carbonate rock, 6 carbonate nodule, 14 volcanic clastic rock, 6 igneous rock, and 3 metamorphic rock from the 5 Cretaceous siliciclastic units. This dataset is supplemented by detailed information on the 22 stratigraphic sections, including sampling location, stratigraphic age, and rock characteristics. This dataset can be used in both basic geological research and interdisciplinary research, such as those associated with computer sciences. It also provides references for mineral, oil and gas prospecting, teaching or general popularization of sciences.
Keywords: thin section; polarized photomicrograph; siliciclastic rocks; central-northern Lhasa Terrane; cretaceous; Tibetan Plateau