SQL & PL/SQL :: Query To Retrieve The Data Without Iteration?

I have one table as shown below,

CREATE TABLE MAT
(matrl varchar2(100),
date_man date,
weight number(10)
);

INSERT INTO MAT(Matrl,DATE_MAN,WEIGHT) VALUES ('mat1','12-DEC-10',100);
INSERT INTO MAT(Matrl,DATE_MAN,WEIGHT) VALUES ('mat2','13-DEC-10',200);
INSERT INTO MAT(Matrl,DATE_MAN,WEIGHT) VALUES ('mat3','21-DEC-10',300);
INSERT INTO MAT(Matrl,DATE_MAN,WEIGHT) VALUES ('mat4','26-DEC-10',400);
INSERT INTO MAT(Matrl,DATE_MAN,WEIGHT) VALUES ('mat5','22-DEC-10',500);
INSERT INTO MAT(Matrl,DATE_MAN,WEIGHT) VALUES ('mat6','02-DEC-10',600);
INSERT INTO MAT(Matrl,DATE_MAN,WEIGHT) VALUES ('mat7','23-DEC-10',700);
INSERT INTO MAT(Matrl,DATE_MAN,WEIGHT) VALUES ('mat8','07-DEC-10',800);

The data will look like this .

matrldate_manWeight
mat112-Dec-10100
mat213-Dec-10200
mat321-Dec-10300
mat426-Dec-10400
mat522-Dec-10500
mat602-Dec-10600
mat723-Dec-10700
mat807-Dec-10800

I need to order by this data in terms of date and need to get the data as shown below. Acc_wt is accumulated weight till the material.

Date Weightacc_wt
mat602-Dec-106000
mat807-Dec-10800600
mat112-Dec-101001400
mat213-Dec-102001500
mat321-Dec-103001700
mat522-Dec-105002000
mat723-Dec-107002500
mat426-Dec-104003200

Can we make use of oracle lag and lead functions here?Or some other methods?